U.S.

This Morning from CBS News, March 23, 2015

By Dan Woo

March 23, 2015 / 7:20 AM EDT / CBS News

First candidate

Ted Cruz is running for president. The Texas Republican senator sent a tweet after midnight saying, "I'm running for president and I hope to earn your support!" Cruz, whose tweet landed on the fifth anniversary of the signing of Obamacare into law, will reprise his announcement this morning at Liberty University in Lynchburg, Virginia. He promises to repeal the federal health care law, abolish the Internal Revenue Service and scrap the Education Department.

ISIS "hit list"

The Pentagon spent the weekend notifying service members who appeared on an ISIS "hit list." The group urges its followers and sympathizers in the U.S. to kill American service members it identifies with names, photos and addresses. CBS News correspondent David Martin reports their bases have contacted local law enforcement agencies in an effort to increase police patrols in the neighborhoods where they live.

Inside the Tunisian attack

Two Americans caught in the crossfire during last week's deadly terror attack in Tunisia are speaking out. CBS News correspondent Jericka Duncan spoke with Giovanna and Hector Gonzalez, who were inside the museum where 20 foreign tourists and three Tunisians, plus the two Tunisian gunmen, were killed.

Iraqi Christians

On the side of a mountain, overlooking the Nineveh Plains of ancient Mesopotamia, is the Monastery of St. Matthew. It's one of the oldest on Earth. Father Joseph Ibrahim is one of only seven monks left there. He told "60 Minutes" correspondent Lara Logan the monastery was founded in 363. Today, it's threatened by ISIS, whose fighters advanced toward St. Matthew's gates shortly after taking Mosul last summer. Kurdish soldiers pushed them back to a village where their flag still flies only four miles from the monastery.

Republican demands

House Majority Leader Kevin McCarthy, R-California, defended Republicans' demands that former Secretary of State Hillary Clinton hand over the server she used to run her private email account while heading up the State Department. McCarthy said on CBS News "Face the Nation, "We're not interested in her private emails. We're not even interested in her emails regarding Russia and the reset or Syria and Assad and the chemical weapons -- only those pertaining to Benghazi."

Schieffer on U.S. - Israel relations

So, the prime minister of Israel doesn't like President Obama and has decided dealing with this administration in no walk in the park. I get that -- there are some in Washington, including some Democrats, who feel the same way. And the president thinks the prime minister dissed him when he spoke to the joint session of Congress without a presidential invitation. I get that, too -- it was not just rude, but disrespectful to the office.

Science fair

Girl Scouts are taking over the White House -- but they're not there to sell cookies. Troop 411 brought its Lego robot to the executive mansion, setting it up for the White House's fifth annual science fair, which aims to bring some of the most innovative experiments and projects by students from around the country to Washington.

Rocket man

An American "rocket man" is scheduled to take off into orbit this coming Thursday, with the hope of setting an endurance record at a time when the U.S. space program might seem to be in eclipse. But Yahoo Tech's David Pogue reports for "Sunday Morning" that NASA's still here and trying to set new records while expanding our knowledge of humans in space.

Franken-fruit

Apples that don't turn brown when sliced? That could transform cooking -- and certainly improve bagged lunches. But, CBS NewsMoney Watch reports on whether consumers would still buy them if the apples were genetically modified.

Pot power

A few labs certified to test the potency of marijuana in Colorado, where recreational use of the drug became legal last year, have found that what is being sold legally on the market today is not your parents' pot. The new data being released today at the national meeting of the American Chemical Society shows how much has changed in the last 20 or 30 years.

Chiara Ferragni

Fashion Blogger Chiara Ferragni sits atop two companies worth $8 million. She is the first blogger to be featured on the cover of Vogue and is now the subject of a case study at Harvard Business School. CBS News correspondent Michelle Miller met the international mogul during the bustle of New York Fashion Week.