White House

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White House spokesman Jay Carney speaks during the daily briefing at the White House on April 23, 2013. (Associated Press)

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President Obama speaks in the Brady Press Briefing Room at the White House in Washington on Friday, April 19, 2013. (Associated Press)

President Barack Obama meets with members of his national security team to discuss developments in the Boston bombings investigation, in the Situation Room of the White House, April 19, 2013. Pictured, from left, are: FBI Director Robert Mueller; Lisa Monaco, Assistant to the President for Homeland Security and Counterterrorism; Attorney General Eric Holder; Deputy National Security Advisor Tony Blinken; and Vice Persident Joe Biden. (Official White House Photo by Pete Souza)

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Former Rep. Gabby Giffords is helped as she arrives for a news conference in the Rose Garden of the White House, Wednesday, April 17, 2013, in Washington, about measures to reduce gun violence and the bill to expand background checks on guns that was defeated in the Senate. (AP Photo/Carolyn Kaster)

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President Obama finishes speaking in the Brady Press Briefing Room of the White House in Washington, Tuesday, April 16, 2013, about the Boston Marathon explosions.(AP Photo/Susan Walsh)

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Sens. John McCain (left), Arizona Republican, and Charles Schumer, New York Democrat, walk from the West Wing of the White House to talk to the media in Washington on April 16, 2013, following a meeting with President Obama on immigration. (Associated Press) **FILE**