Obama arrives in Africa

President Obama and first lady Michelle Obama shake hands with Senegal's President Macky Sall and his wife Marieme Faye Sall at the presidential palace in Dakar, June 27, 2013.

Obama is visiting Senegal, South Africa and Tanzania on a weeklong trip.

Watch more: Obama's weeklong Africa trip

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U.S. President Barack Obama looks out to sea through the "Door of No Return," at the slave house on Goree Island, in Dakar, June 27, 2013.

Obama called his visit to a Senegalese island from which Africans were said to have been shipped across the Atlantic Ocean into slavery, a "very powerful moment."

See more photos of Goree Island here

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People line the route of President Obama's motorcade on his way to meet with Senegalese President Macky Sall at the Presidential Palace in Dakar, June 27, 2013.

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President Barack Obama speaks during a news conference with Senegalese President Macky Sall at the Presidential Palace in Dakar, Senegal, June 27, 2013.

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Signs showing U.S. President Barack Obama alongside Senegalese President Macky Sall saying "Welcome Home" are positioned along the road in Dakar, June 27, 2013.

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U.S. President Barack Obama is welcomed by a Senegalese honor guard as he arrives at the presidential palace in Dakar, Senegal, June 27, 2013.

President Obama landed in Senegal Wednesday night to kick off a weeklong trip to Africa, a three-country visit aimed at overcoming disappointment on the continent over the first black U.S. president's lack of personal engagement during his first term.

Credit: Carolyn Kaster/AP

U.S. first lady Michelle Obama sits with Principal Rouguy Ly Sall, right, as a student reads during a visit to the all-girls Martin Luther King Middle School in Dakar, Senegal, June 27, 2013.

Senegal's national slogan, printed on the wall behind them, reads "One People, One Goal, One Faith."

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U.S. first lady Michelle Obama waves to an audience after visiting the all-girls Martin Luther King Middle School in Dakar, June 27, 2013.

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Michelle Obama shared this photograph from Senegal, writing "My first instagram! So inspired and so impressed by these extraordinary young women," June 27, 2013.

Credit: Instagram/Michelle Obama

People line the route of President Obama's motorcade on his way to meet with Senegalese President Macky Sall at the Presidential Palace in Dakar, June 27, 2013.

Credit: Evan Vucci/AP

U.S. President Barack Obama, left, speaks with Senegalese President Macky Sall during a bilateral meeting at the Presidential Palace in Dakar, June 27, 2013.

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President Obama, with daughter Sasha, waves as he disembarks from Air Force One on arrival at the airport in Dakar, June 26, 2013.

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President Barack Obama and first lady Michelle Obama are greeted by Minister of International Relations and Cooperation Maite Mkoana-Mashabne after arriving at Waterkloof Air Force Base in Pretoria, South Africa, June 28, 2013.

Credit: Chip Somodevilla

President Obama (R) and his daughter Malia Obama arrive at Waterkloof Air Force Base in Pretoria, South Africa, June 28, 2013. This is Obama's first official visit to South Africa, where he is schedule to hold bilateral meetings with President Jacob Zuma, host a town hall meeting with students in Soweto Township and visit Robben Island, where former President Nelson Mandela spent some of his 27 years in prison for fighting against Apartheid.

Credit: Chip Somodevilla/Getty Images

President Obama flanked and first lady Michelle Obama, stand with South African President Jacob Zuma, second right, and his wife Tobeka Madiba Zuma, right, on the steps of Union Building in Pretoria, South Africa, June 29, 2013.

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A secret service agent shouts from the convoy of President Obama to stop spectators from taking photos as the President arrives in Soweto, South Africa, June 29, 2013.

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President Obama, left and first lady Michelle right, wave as they board their flight on Air Force One bound for Tanzania.

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President Barack Obama speaks at a joint news conference with Tanzanian President Jakaya Kikwete at the State House in Dar Es Salaam, Tanzania, July 1, 2013.

The president is traveling in Tanzania on the final leg of his three-country tour in Africa.

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A member a brass band waits to welcome President Obama next to the State House in Dar es Salaam, Tanzania ahead of Obama's meeting with Tanzanian President Jakaya Kikwete, July 1, 2013.

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President Obama inspects troops during an arrival ceremony at Julius Nyerere International Airport in Dar Es Salaam, Tanzania, July 1, 2013.

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A woman wearing a skirt with the face of U.S. President Barack Obama holds an American flag ready to welcome him at the State House in Dar es Salaam, Tanzania, July 1, 2013.

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President Obama, accompanied by Tanzanian President Jakaya Kikwete, shakes hands outside the State House in Dar es Salaam, Tanzania, July 1, 2013.

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President Barack Obama, Tanzanian President Jakaya Kikwete, first lady Michelle Obama and Tanzanian first lady Salma Kikwete greet a cheering crowd as they arrive at the State House in Dar es Salaam, Tanzania, July 1, 2013.

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President Obama and first lady Michelle Obama, wave as they enter the State House in Dar es Salaam, Tanzania, accompanied by Tanzanian President Jakaya Kikwete, center-left, and Tanzanian First Lady Salma Kikwete, July 1, 2013.

Credit: Ben Curtis/AP