Barack Obama

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President Barack Obama pauses as he answers a question regarding the ongoing situation in the Ukraine, during his meeting with Israeli Prime Minister Benjamin Netanyahu, Monday, March 3, 2014, in the Oval Office of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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** FILE ** In this Feb. 28, 2014, file photo, President Barack Obama speaks in the James Brady Press Briefing Room of the White House in Washington. (AP Photo/Charles Dharapak, File)

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President Barack Obama listens as Israeli Prime Minister Benjamin Netanyahu speaks during their meeting in the Oval Office of the White House in Washington, Monday, March 3, 2014. Seeking to keep a pair of delicate diplomatic efforts afloat, Obama will personally appeal to Netanyahu to move forward on peace talks with the Palestinians, while also trying to manage Israel's deep suspicion of his pursuit of a nuclear accord with Iran. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama meets with Israeli Prime Minister Benjamin Netanyahu in the Oval Office of the White House in Washington, Monday, March 3, 2014. Seeking to keep a pair of delicate diplomatic efforts afloat, Obama will personally appeal to Netanyahu to move forward on peace talks with the Palestinians, while also trying to manage Israel's deep suspicion of his pursuit of a nuclear accord with Iran. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama gestures as he answers a question regarding the ongoing situation in the Ukraine, during his meeting with Israeli Prime Minister Benjamin Netanyahu, Monday, March 3, 2014, in the Oval Office of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)