White House

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President Barack Obama steps off Marine One helicopter on the South Lawn of the White House in Washington as he returns from Baltimore, Md., Monday, Feb. 14, 2011. (AP Photo/Charles Dharapak)

President Barack Obama walks with budget director Jack Lew and Education Secretary Arne Duncan on the South Lawn of the White House in Washington as they travel to Baltimore, Md., Monday, Feb. 14, 2011. (AP Photo/Charles Dharapak)

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Office of Management and Budget Director Jack Lew discusses the White House budget on Monday, Feb. 14, 2011, in Washington. (AP Photo/Evan Vucci)

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President Obama makes a statement on the resignation of Egypt's President Hosni Mubarak in the Grand Foyer at the White House in Washington, Friday, Feb. 11, 2011. (AP Photo/Carolyn Kaster)

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President Obama meets with Egyptian President Hosni Mubarak on Wednesday, Sept. 1, 2010, in the Oval Office of the White House in Washington. (AP Photo/Susan Walsh)

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House Speaker John A. Boehner (center), accompanied by House Majority Leader Eric Cantor (right) and House Majority Whip Kevin McCarthy, leave the White House in Washington on Wednesday, Feb. 9, 2011, following a luncheon with President Obama. (AP Photo/Pablo Martinez Monsivais)

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** FILE ** Singer Barbra Streisand arrives at the White House for a state dinner in honor of Chinese President Hu Jintao on Jan. 19, 2011. (AP Photo/Evan Vucci)

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Egyptian flags wave during a Jan. 29 demonstration in front of the White House demanding that Egyptian President Hosni Mubarak step down. (Associated Press)

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President Obama meets with Egyptian President Hosni Mubarak, left, in the Oval Office of the White House in Washington on Sept. 1, 2010. U.S. intelligence agencies' failure to predict the uprisings in Tunisia and Egypt had drawn criticism from the White House and Congress. (AP Photo/Susan Walsh, File)

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President Reagan and first lady Nancy Reagan, with their dog Rex, wave to White House visitors on July 27, 1986. (Associated Press)

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House Speaker Thomas P. "Tip" O'Neill Jr. (right) leans forward to ask President Reagan a question during the Social Security bill-signing ceremony on the South Lawn of the White House on April 20, 1983, as various political figures look on. (Associated Press)

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First lady Nancy Reagan gives a loving look toward President Reagan as they walk outside the White House on July 16, 1986. The Reagans were waiting to greet their state dinner guest, Pakistani Prime Minister Mohammad Khan Junejo. (Associated Press)

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White House press secretary Robert Gibbs briefs reporters Wednesday at the White House on the situation in Egypt. (Associated Press)

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President Obama speaks about the situation in Egypt in the Grand Foyer of the White House in Washington, Tuesday, Feb. 1, 2011. (AP Photo/Evan Vucci)

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President Obama leaves the lectern at the White House on Tuesday after speaking about the crisis in Egypt. He praised President Hosni Mubarak's decision not to seek re-election in September. (Associated Press)

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President Obama speaks Tuesday in the Grand Foyer of the White House about the situation in Egypt. (Associated Press)

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In this photo released by the White House, President Obama is briefed on the events in Egypt by his national security team in the Situation Room of the White House on Saturday. Thousands of protesters in Egypt have thrown the country's 30-year-old regime into tumult. (Associated Press)