Barack Obama

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President Barack Obama and Japanese Prime Minister Shinzo Abe visit the Lincoln Memorial on the National Mall in Washington, Monday, April 27, 2015. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama, left, and Japanese Prime Minister Shinzo Abe visit the Lincoln Memorial, looking toward the Washington Monument, on the National Mall in Washington, Monday, April 27, 2015. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama, right, brings out actor Keegan-Michael Key from Key & Peele to play the part of "Luther, President Obama’s anger translator" during his remarks at the White House Correspondents' Association dinner at the Washington Hilton on Saturday, April 25, 2015, in Washington. (AP Photo/Evan Vucci)

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President Barack Obama, left, brings out actor Keegan-Michael Key from Key & Peele to play the part of "Luther, President Obama’s anger translator" during his remarks at the White House Correspondents' Association dinner at the Washington Hilton on Saturday, April 25, 2015, in Washington. (AP Photo/Evan Vucci)

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President Barack Obama laughs at a joke during the White House Correspondents' Association dinner at the Washington Hilton on Saturday, April 25, 2015, in Washington. (AP Photo/Evan Vucci)

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President Barack Obama offers a toast during the White House Correspondents' Association dinner at the Washington Hilton on Saturday, April 25, 2015, in Washington. (AP Photo/Evan Vucci)

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President Barack Obama, left, brings out actor Keegan-Michael Key from Key & Peele to play the part of "Luther, President Obama’s anger translator" during his remarks at the White House Correspondents' Association dinner at the Washington Hilton on Saturday, April 25, 2015, in Washington. (AP Photo/Evan Vucci)

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President Barack Obama, left, is greeted by White House Correspondents Association president Christi Parsons during the White House Correspondents' Association dinner at the Washington Hilton on Saturday, April 25, 2015, in Washington. (AP Photo/Evan Vucci)

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President Barack Obama, left, talks with White House Correspondents Association president Christi Parsons during the White House Correspondents' Association dinner at the Washington Hilton on Saturday, April 25, 2015, in Washington. (AP Photo/Evan Vucci)

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First lady Michelle Obama, left, and President Barack Obama stand for the national anthem during the White House Correspondents' Association dinner at the Washington Hilton on Saturday, April 25, 2015, in Washington. (AP Photo/Evan Vucci)

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President Barack Obama holds up a jar full of paper clips while speaking at the Office of the Director of National Intelligence's (ODNI) 10th anniversary at ODNI headquarters in McLean, Va., Friday, April 24, 2015. Obama was making a joke about Director of National Intelligence James R. Clapper and used the jar to help illustrated the point. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama pauses while speaking at the Office of the Director of National Intelligence's (ODNI) 10th anniversary at ODNI headquarters in McLean, Va., Friday, April 24, 2015. The president told members of the intelligence community that he appreciates their service and understands they don't take their work lightly. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama speaks at the Office of the Director of National Intelligence's (ODNI) 10th anniversary at ODNI headquarters in McLean, Va., Friday, April 24, 2015. The president told members of the intelligence community that he appreciates their service and understands they don't take their work lightly. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama pauses while speaking at the Office of the Director of National Intelligence’s (ODNI) 10th anniversary at ODNI headquarters in McLean, Va., Friday, April 24, 2015. The president told members of the intelligence community that he appreciates their service and understands they don't take their work lightly. (AP Photo/Pablo Martinez Monsivais)

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In this April 23, 2015, file photo, President Obama pauses while speaking in the Brady Press Briefing Room of the White House in Washington, where he took full responsibility for deaths of American, Italian hostages, and expressed apologies. The accidental killing of two hostages in a U.S. counterterrorism operation against al Qaeda has raised pressure on the White House to revise the nation’s oft-criticized strategy for dealing with abducted Americans. (AP Photo/Pablo Martinez Monsivais, File)

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President Barack Obama shakes hands New England wide receiver Julian Edelman during a ceremony on the South Lawn of the White House in Washington, Thursday, April 23, 2015, where the president honored the Super Bowl Champion New England Patriots for their Super Bowl XLIX victory. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama pauses as he speaks in the Brady Press Briefing Room of the White House in Washington, Thursday, April 23, 2015. The president took full responsibility for deaths of American, Italian hostages, expresses apologies. (AP Photo/Susan Walsh)