Since his election in 2016, President Trump's team has undergone some dramatic shifts in personnel.

Here's a look at who Mr. Trump has tapped for his team since he first took office. 

Mr. Trump chose Pence as his running mate in July 2016.

Pence also took over leading the transition team after New Jersey Gov. Chris Christie was ousted from the role. 

Pence was elected governor of Indiana in 2013 and before that served in the House of Representatives. 

Kushner, a New York real estate developer who is married to Mr. Trump's daughter Ivanka, was a key adviser during the campaign and remained influential after the election.

The president put him in charge of the new White House Office of American Innovation to overhaul government using ideas from the business world, and also asked Kushner to help broker a Mideast peace agreement.

Ivanka Trump took on an official, but unpaid, White House role in late March 2017.

President Trump's 35-year-old daughter contributed significantly to her father's campaign, transition, and now, his presidency. She already had an office in the White House, but taking on an official role meant she has to comply with ethics rules. 

Pompeo served as CIA director for the first year of the Trump administration, and in March 2018 the president chose him for secretary of state to replace Rex Tillerson. Pompeo was confirmed by the Senate on April 26.

Pompeo, previously a Republican congressman from Kansas, was a member of the House Intelligence Committee and a former Army captain. 

William Barr was confirmed as attorney general by the Senate on February 14, 2019.

Barr served in the same position once before, from 1991 to 1993, during the first Bush administration.

On December 14, 2018, Mr. Trump announced on Twitter that Mick Mulvaney would step in as acting chief of staff to replace the outgoing John Kelly.

Mulvaney has served as the White House budget director since February 2017. The former South Carolina congressman was elected to the House of Representatives as part of the tea party wave in 2010.

The Senate confirmed Mulvaney as budget director on Feb. 16.

He regularly votes against increasing the government's borrowing cap and presses for major cuts to benefit programs as a means to balance the budget.

President Trump named Patrick Shanahan acting defense secretary following the resignation of James Mattis. Shanahan took over on Jan. 1, 2019.

Shanahan came to the Pentagon in 2017 as deputy defense secretary. Before that he spent three decades at aerospace giant Boeing Co.

President Trump named Bill Shine, former co-president of Fox News and Fox Business Network, as an assistant to the president and deputy chief of staff for communications on July 5, 2018.

Shine, who helped build Fox News into what it is today, resigned from the network in May 2017. A close ally of Roger Ailes, Shine was accused in lawsuits of helping Ailes cover up allegations of sexual harassment, although he was never directly linked to wrongdoing. 

Shine's arrival at the White House came after the president's previous communications director, Hope Hicks, left at the end of March 2018.

Former Ambassador to the United Nations John Bolton was named as national security adviser on March 22, 2018, replacing General H.R. McMaster. 

"I am pleased to announce that, effective 4/9/18, @AmbJohnBolton will be my new National Security Advisor," Mr. Trump wrote on Twitter. 

Bolton is known to be a hardliner on the Iran nuclear deal and on North Korea. He became Mr. Trump's third national security advisor in just over a year. 

Kirstjen Nielsen was confirmed to lead the Department of Homeland Security in December 2017.

The post was left vacant in July when John Kelly moved over to become White House chief of staff. 

Nielsen is a cybersecurity expert who was serving as deputy White House chief of staff. She previously served as Kelly's chief of staff when he was in the Homeland Security position. 

Haspel was confirmed as CIA director on March 17, 2018. She replaced Mike Pompeo after he left the post to become secretary of state.

The first woman to head the CIA, she was also first female CIA officer to serve as deputy director and before that served the agency overseas and in top management posts. Haspel once ran a secret CIA prison where terror suspects were waterboarded, and helped carry out an order that the CIA destroy its waterboarding videos. 

Steven Mnuchin was confirmed as treasury secretary in February 2017 by a vote of 53-47.

Mnuchin served as the national finance chairman of the Trump campaign. He also spent 17 years working for Goldman Sachs. 

Andrew Wheeler, who was serving as deputy administrator of the EPA, assumed the role of acting EPA administrator after Scott Pruitt resigned on July 5, 2018. 

Prior to his deputy nomination by President Donald Trump, Wheeler worked as a lobbyist with a client list that included Murray Energy, one of the nation's largest coal mining companies. 

On December 15, 2018, President Trump announced on Twitter that Ryan Zinke would be leaving his post as Interior secretary at the end of 2018.

Zinke's tenure at Interior was marked by investigations by the department's Inspector General and the Justice Department over his spending and other issues.

He is a former Navy SEAL commander and decorated Iraq veteran.

President Trump nominated former pharmaceutical executive Alex Azar to lead the Department of Health and Human Services on Nov. 13, 2017.

Azar had served as general counsel of HHS and later as the department's deputy secretary during President George W. Bush's administration.

Following his time at the department, he rose to become president of Eli Lilly USA, a global pharmaceutical company. If confirmed, Azar would replace Tom Price, who resigned in September.

President Trump announced his selection of Alexander Acosta for labor secretary on Feb. 16, 2017, a day after the president's previous pick, Andrew Puzder, withdrew his name from consideration for the post. 

Acosta served as assistant attorney general for the Civil Rights Division under President George W. Bush and was previously a member of the National Labor Relations Board.

Mr. Trump named Kellyanne Conway as counselor to the president on Dec. 22, 2016.

Conway, a political strategist and pollster, helped turn Trump's campaign around while serving as campaign manager. She's been serving as a senior member of the Trump transition team. 

Donald Trump married Melania, a former model from Slovenia, in 2005.

As first lady, she has focused on the issue of combating cyber-bullying, launching a campaign called "Be Best."

Television pundit Larry Kudlow accepted President Trump's offer to head the White House National Economic Council on March 14, 2018.

The announcement came just days after Gary Cohn announced he was stepping down.

Kudlow, a regular on CNBC and other outlets, is an economic analyst who worked in the Office of Management and Budget during the Reagan administration. 

Carson was confirmed by the Senate as the secretary of the Department of Housing and Urban Development (HUD) on March 2, 2017.

Carson was raised in an impoverished area of Detroit and later became a renowned neurosurgeon. He drew national attention when he ran in the Republican primary race, and later endorsed Mr. Trump.

The 65-year-old has no previous policy experience in the field of urban development, and has never held elected office.

Haley was confirmed for the post of U.S. Ambassador to the United Nations on Jan. 24, 2017. 

She was the first woman to be named to Mr. Trump's Cabinet. Before that, Haley, a Republican, served as the governor of South Carolina since 2011. 

Haley announced plans to step down after two years and President Trump said he'd nominate State Department spokeswoman Heather Nauert to replace her.

Mr. Trump chose Perdue to lead the Agriculture Department in January 2017.

Perdue is a farmer's son who built businesses in grain trading and trucking before serving as the governor of Georgia from 2003 to 2011.

Coats was named to the role of director of national intelligence on Jan. 5, 2017.

Coats was a U.S. senator from Indiana from 1989 to 1999, and again from 2011 to early 2017 when he retired.

Perry was confirmed by the Senate as energy secretary on March 2, 2017.

Perry served as governor of Texas from 2000 to 2015. He ran unsuccessfully for the White House in the 2012 and 2016 Republican primaries. 

Perry has previously suggested that the Department of Energy should be abolished. 

Ross was confirmed by the Senate as commerce secretary on Feb. 27, 2017.

Ross is an investor and former banker, experienced in buying failing companies and reviving them. He is worth an estimated $2.9 billion.

The Senate confirmed Elaine Chao to serve as transportation secretary on Jan. 31, 2017. 

Chao served as labor secretary under President George W. Bush from 2001 to 2009. She was the only Cabinet member to serve through his entire two terms in the White House, and the first Asian-American woman ever to hold a Cabinet-level position. 

Chao is married to Senate Majority Leader Mitch McConnell.

DeVos' nomination as education secretary was confirmed by the Senate on Feb. 7, 2017. 

DeVos had become one of Trump's most controversial Cabinet picks, and she only garnered 50 lawmakers' votes. Vice President Mike Pence cast the tie-breaking vote.

The philanthropist and education activist, who has strongly supported charter schools and vouchers, served as chair of the Michigan Republican Party from 1996 to 2000.

Robert L. Wilkie was confirmed as Veteran Affairs (VA) secretary on July 23, 2018. Wilkie, a former assistant secretary of defense under President George W. Bush, received bipartisan support in the Senate. 

Wilkie replaced David Shulkin, who was fired amid ethics allegations and internal rebellion at the department over the role of private care for veterans. 

Washington lawyer Pat Cipollone replaced Donald McGahn as White House counsel in December 2018.

Cipollone worked at the Justice Department in the 1990s, as counsel to then-Attorney General William P. Barr.

Mr. Trump chose Clayton to head the Securities and Exchange Commission on Jan. 4, 2017.

Clayton is a Wall Street attorney with experience in corporate mergers and public stock launches.

Lighthizer was named as U.S. trade representative on Jan. 3, 2017.

Lighthizer was previously a deputy U.S. trade representative under President Reagan, and has since worked as a trade attorney in Washington, D.C.

Dan Scavino (center) was named as White House social media director on Dec. 22, 2017.

Scavino managed social media during the Trump campaign. He previously worked as the general manager of the Trump National Golf Club.

Mr. Trump named Navarro to lead the newly created White House trade council on Dec. 21, 2017.

Navarro is a business professor at the University of California-Irvine. In his book, "Death by China," he endorsed a hard-line approach toward U.S. economic relations with China. 

McMahon was confirmed by the Senate to lead the Small Business Administration on Feb. 14, 2017.

McMahon and her husband, Vince, founded and built World Wrestling Entertainment (WWE). 

President Trump nominated Huntsman to serve as ambassador to Russia.

Huntsman, 56, served as the U.S. ambassador to China under President Obama and as the U.S. ambassador to Singapore under Presidents George H.W. Bush and Bill Clinton. He also served as governor of Utah from 2005 until 2009, and he ran for president as a Republican in 2012.

Mr. Trump selected New York bankruptcy attorney David Friedman to be the U.S. ambassador to Israel.

Friedman was a Trump campaign adviser whose views align with the Israeli far right.

Branstad was named to the post of U.S. ambassador to China on Dec. 7, 2016.

Branstad served as governor of Iowa from 1983 to 1999 and again since 2011, making him the longest-serving governor in American history. 

Bloomberg reported that Branstad is a longtime friend of Chinese President Xi Jinping.

President Trump announced in June 2018 that Rear Adm. Douglas Fears would replace Homeland Security Adviser Tom Bossert, who had left the post after less than a year.

Kelly took over as White House chief of staff in the summer of 2017, replacing Reince Priebus. In early December 2018, President Trump announced that Kelly would be leaving by the end of the year.

Before that, Kelly, a retired Marine Corps General, had been serving as secretary of the Department of Homeland Security.

Mattis resigned as defense secretary in December 2018 after nearly two years in the job, citing disagreements with the president. His deputy, Patrick Shanahan, was named to take over as acting defense secretary Jan. 1, 2019.

Mattis, a retired Marine Corps general and decorated war veteran, has been a vocal critic of the Iran nuclear deal and a skeptic of Russian President Vladimir Putin.

McGahn was announced as an assistant to the president and White House counsel on Nov. 25, 2016; he left the position in October 2018.

McGahn was general counsel for the Trump campaign and was working on the transition.

Sessions was confirmed as attorney general by a vote of 52-47 in a bitterly divided Senate and served in the role for nearly two years.

Sessions came under fire from President Trump after he recused himself from overseeing Robert Mueller's special counsel investigation.

On Nov. 7, 2018, the day after the midterm elections, the president requested and received Sessions' resignation.

Flynn was chosen on Nov. 18, 2016, for the role of national security adviser but resigned on Feb. 13, 2017, less than a month after President Trump took office. 

Flynn came under fire for misleading Vice President Mike Pence about his talks with the Russian ambassador, including discussions of U.S. sanctions.

The former Army lieutenant general was a registered Democrat, but became a critic of President Obama and campaigned aggressively for Mr. Trump. He served as the director of the Defense Intelligence Agency from 2012 to 2014. 

Pruitt was confirmed 52-46 as head of the Environmental Protection Agency, a federal agency he repeatedly sued to during the Obama administration, when he was Oklahoma's attorney general.

Pruitt came under fire from environmentalists due to his close ties with oil and gas companies and  statements he's made casting doubt on climate change.

He resigned on July 5, 2018, following intense scrutiny for a series of questionable ethical decisions and his spending.

Shulkin was confirmed to lead the Department of Veterans Affairs on Feb. 13, 2017 by a unanimous vote in the Senate. He was fired by the president on March 28, 2018. 

Shulkin previously served as the VA's undersecretary for health and spent more than two decades in hospital management.

U.S. Army Lieutenant General H.R. McMaster (L) was named national security adviser in February 2017 to replace Gen. Michael Flynn, who was ousted for withholding information from Vice President Mike Pence about his contacts with Russia.

On March 22, 2018, Trump announced that McMaster would be replaced by former Ambassador to the United Nations John Bolton.

Cohn announced that he was resigning from his role as Director of the National Economic Council and chief economic advisor to President Trump on March 6, 2018.

Cohn had urged the president against imposing steep tariffs on steel and aluminum, which President Trump announced the week before. 

He had been with the administration since the beginning. He was formerly the president and COO of Goldman Sachs. 

Tillerson, the former CEO of ExxonMobil, served as secretary of state until March 13, 2018, when President Trump ousted him after months of reported tensions and public disputes.

Before his confirmation, some leading lawmakers voiced concern about Tillerson's business ties to Russia and his relationship with Russian President Vladimir Putin, who honored Tillerson with the Order of Friendship in 2013.

Icahn was named to the role of special adviser on regulatory reform on Dec. 21, 2016 and left that role the following August.

The billionaire investor offered advice to Mr. Trump on economic regulations, but was not a federal employee and had no specific duties in the administration.

Hicks was officially named White House communications director on Sept. 12, 2017, after filling that role in an interim basis since Anthony Scaramucci's departure in July.

She announced her resignation on Feb. 28, 2018, a day after testifying for nine hours before the House Intelligence Committee as part of its investigation into Russia's interference in the 2016 election.

Manigault was named as an assistant to the president and director of communications for the Office of Public Liaison on Jan. 4, 2017.

In December 2017, the White House announced that Manigault "resigned ... to pursue other opportunities" and that her last day would be Jan. 20, 2018.  

Manigault, a vocal Trump supporter during the campaign, gained fame as a contestant on season one of "The Apprentice."

Price, a Republican representative from Georgia, was confirmed as health and human services secretary Feb. 10, 2017, by a Senate vote of 52-47.

He resigned on Sept. 29, 2017, amid scrutiny over his use of private planes at taxpayer expense and three days after Senate Republican leaders decided not to hold a vote on a bill to repeal Obamacare because they didn't have the votes to pass the bill.

Price, an orthopedic surgeon by trade, served five terms in Congress and was chairman of the House Budget Committee.

He has led the charge to repeal Obamacare, also known as the Affordable Care Act, saying it doesn't give patients or doctors adequate health care choices.

Scaramucci was named White House communications director on July 21, 2017. But on July 31, President Trump removed him from the position after Scaramucci's widely publicized rant criticizing other members of the president's team. 

Prior to Scaramucci's appointment, Sean Spicer had been serving as both communications director and press secretary. Spicer resigned from the Trump administration on the same day Scaramucci was brought on.

Mr. Trump announced Bannon's appointment to White House strategist on Nov. 13, 2016, setting off a firestorm of criticism. After a turbulent time in the White House, Bannon's tenure ended on Aug. 18, 2017.

Bannon headed the right-wing Breitbart News for almost five years before becoming CEO of the Trump campaign. Critics decried Bannon's role in encouraging the "alt-right" movement and white nationalist supporters.

One of Mr. Trump's first personnel choices was to name Priebus as the White House chief of staff on Nov. 13, 2016. Priebus had served as the chairman of the Republican National Committee since 2011. 

But after just six months in office, on July 28, 2017, Trump tweeted that he had named John Kelly to replace Priebus as White House chief of staff.

Spicer was named as press secretary on Dec. 22, 2016. He resigned on July 21, 2017, shortly after President Trump selected Anthony Scaramucci as White House communications director. 

Spicer had essentially been serving as both communications director and press secretary but had stepped back from press secretary duties in the weeks before his resignation. 

Previously, Spicer served as communications director of the Republican National Committee since 2011.

Dubke resigned from his role as White House communications director in May 2017.

Previously, Dubke served as a partner for the political advertising group Crossroads Media, which describes itself as "the premier Republican media services firm." Dubke also led the Virginia-based Black Rock Group, a strategic communications and public affairs firm.

Walsh was named deputy chief of staff on Jan. 4, 2016, but she left her post in March to join an outside political organization supporting the Trump agenda.

Walsh was serving as the chief of staff for the Republican National Committee before joining the White House staff.

The president-elect nominated Puzder as labor secretary on Dec. 8, 2017. but Puzder withdrew from consideration two months later.

Puzder, the CEO of CKE Restaurants, which owns fast food chains Carl's Jr. and Hardee's, came under fire for business practices including his company's racy advertising and his opposition to raising the minimum wage. He also admitted that he and his wife had employed an undocumented immigrant for housework, and faced negative headlines about his messy public divorce from three decades ago.