White House

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President Obama speaks during the Easter prayer breakfast in the East Room of the White House in Washington on Wednesday, April 4, 2012. (AP Photo/Carolyn Kaster)

** FILE ** In this March 14, 2012, file photo, Warren Buffett and Astrid M. Buffett arrive at the Booksellers area of the White House in Washington for the State Dinner hosted by President Barack Obama and first lady Michelle Obama for British Prime Minister David Cameron and his wife Samantha. (AP Photo/Charles Dharapak, File)

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**FILE** Medal of Honor recipient Sgt. 1st Class Leroy Petry and his wife, Ashley, arrive March 14, 2012, at the Booksellers area of the White House for the State Dinner hosted by President Obama and first lady Michelle Obama for British Prime Minister David Cameron and his wife Samantha. (Associated Press)

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President Obama speaks in the Rose Garden of the White House on March 29, 2012, to urge Congress to eliminate tax breaks for oil and gas companies. (Associated Press)

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This map, released by the Federal Emergency Management Agency, shows the likely effects from a 10-kiloton nuclear device set off a few blocks north of the White House. (AP Photo/FEMA)

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This map, released by the Federal Emergency Management Agency, is contained in a report from a study that analyzed the likely effects from terrorists setting off a 10-kiloton nuclear device a few blocks north of the White House. The map shows a summary of severe, moderate and light damage zones, and types of damage or injuries likely to be encountered by responders. (AP Photo/FEMA)

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The red carpet of the North Portico is prepared for President Obama to welcome British Prime Minister David Cameron to the White House for a state dinner earlier this month. Mr. Obama is using privileged access to one of America's greatest landmarks to reward his most generous financial supporters. (Associated Press)

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White House Senior Press Lead Jesse Lewin (left) and Press Lead Jeff Tiller (center) use their cellphones after the main entrance to the Blue House was blocked by South Korean security personnel during President Obama's visit with South Korean President Lee Myung-bak in Seoul on Sunday, March, 25, 2012. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama calls out to media as he walks across the South Lawn to the White House from Marine One, Thursday, March 22, 2012, in Washington, as he returns from Ohio. (AP Photo/Carolyn Kaster)

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President Barack Obama answers a reporter's question about the death of Trayvon Martin, Friday, March 23, 2012, in the Rose Garden of the White House in Washington. (AP Photo/Haraz N. Ghanbari)

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** FILE ** President Obama stands with Jim Yong Kim, president of Dartmouth College and Mr. Obama's nominee to be the next World Bank president, in the Rose Garden of the White House on Friday, March 23, 2012. (Associated Press)

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Warren Buffett attends the State Dinner with President Barack Obama and British Prime Minister David Cameron at the White House in Washington, Wednesday, March 14, 2012. (AP Photo/Susan Walsh)

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President Eisenhower and first lady Mamie Eisenhower chat on the South Lawn with the Truman balcony of the White House visible behind them. (Associated Press)

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President Obama, first lady Michelle Obama and daughter Sasha hold hands as they walk from the White House through Lafayette Park to attend services at St. John's Episcopal Church in Washington on Sunday, March 18, 2012. (AP Photo/Carolyn Kaster)

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Iran was high on the agenda as President Obama met with British Prime Minister David Cameron at the White House on Wednesday. (Associated Press)

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President Obama and first lady Michelle Obama pose for an official photo with British Prime Minister David Cameron and his wife, Samantha, at the White House on March 14, 2012, before a State Dinner. (Associated Press)

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From left, Samantha Cameron, wife of British Prime Minister David Cameron, first lady Michelle Obama, British Prime Minister David Cameron and President Barack Obama wave from the balcony of the White House, Wednesday, March 14, 2012, during a state arrival ceremony on the South Lawn. (AP Photo/Carolyn Kaster)

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President Obama welcomes British Prime Minister David Cameron during an official arrival ceremony on the South Lawn of the White House in Washington on Wednesday, March 14, 2012. (AP Photo/Charles Dharapak)

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Waving from the balcony of the White House in Washington on Wednesday, March 14, 2012, are (from left) Samantha Cameron, wife of British Prime Minister David Cameron; first lady Michelle Obama; Mr. Cameron; and President Obama. (AP Photo/Carolyn Kaster)