McCain’s comments come a day after Defense Secretary Chuck Hagel said Afghanistan’s failure to sign the deal would create the real possibility of pulling U.S. troops out of the country because of a lack of security.
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The Pulitzer Prize winner wrote the administration "cherry picked intelligence."
HHS Secretary Kathleen Sebelius and Edward Snowden are also among the finalists.
Obama is expected deliver remarks about Mandela’s legacy at some point during the trip.
“Don't just buy a new video game, make one,” he said.
"I think I just became the first president to ever publicly mention Area 51," he said.
"Their triumphs have lifted our spirits," Obama said at White House.
The Senate majority leader's older brother, Don Reid, was 85.
"We’re in the middle of the end of the apartheid struggle now," Rev. Jesse Jackson said.
"Powerful sanctions and a credible military threat" are also needed, he said.