White House

U.S. President Barack Obama and former President Bill Clinton walk past the Rose Garden to host an event marking the 20th anniversary of the national service program AmeriCorps at the White House in Washington September 12, 2014. In 1993, Clinton signed the bill that created AmeriCorps.

Kevin Lamarque/Reuters

U.S. President Barack Obama and former President Bill Clinton walk past the Rose Garden to host an event marking the 20th anniversary of the national service program AmeriCorps at the White House in Washington

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and others, stand on the South Lawn of the White House in Washington, Thursday, Sept. 11, 2014, as they observe a moment of silence to mark the 13th anniversary of the 9/11 attacks.

Charles Dharapak/AP

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and others, stand on the South Lawn of the White House in Washington on Thursday, as they observe a moment of silence to mark the 13th anniversary of the 9/11 attacks

A worker power washes the West Wing of t...A worker power washes the West Wing of the White House January 15, 2014 in Washington, DC. AFP PHOTO/Brendan SMIALOWSKIBRENDAN SMIALOWSKI/AFP/Getty Images

Brendan Smialowski/AFP

A worker power-washes the West Wing of the White House in Washington D.C

U.S. first lady Obama and her daughters Sasha and Malia welcome the official White House Christmas tree at the North Portico of the White House in Washington...U.S. first lady Michelle Obama (R) and her daughters Sasha and Malia welcome the official White House Christmas tree at the North Portico of the White House in Washington November 29, 2013. The 18.5-foot Douglas Fir was grown by Chris Botek, a second generation Christmas tree farmer from Crystal Spring Tree Farm in Lehighton, Pennsylvania.    REUTERS/Jason Reed

Jason Reed/Reuters

Michelle Obama, US first lady, and her daughters Sasha and Malia welcome the official White House Christmas tree to the White House in Washington. The 18.5ft Douglas Fir was grown by Chris Botek, a second-generation Christmas tree farmer from Crystal Spring Tree Farm in Lehighton, Pennsylvania. 

A Marine closes a door to Marine One with US President Barack Obama on the South Lawn of the White House on May 28, 2013 in Washington. Obama is traveling to the New Jersey shore to survey rebuilding efforts in areas effected by last year's hurricane Sandy.     AFP PHOTO/Brendan SMIALOWSKIBRENDAN SMIALOWSKI/AFP/Getty Images

Brendan Smialowski/AFP

A Marine on Tuesday closes the door to Marine One, carrying President Barack Obama, on the south lawn of the White House, Washington. Mr Obama is travelling to the New Jersey shore to survey rebuilding efforts in areas affected by last year’s Hurricane Sandy

Barack Obama, David Cameron...President Barack Obama and British Prime Minister David Cameron walk off the stage after their joint news conference,  Monday, May 13, 2013, in the East Room of the White House in Washington, where they talked about various topics including Syria's civil war. (AP Photo/Jacquelyn Martin)

Jacquelyn Martin/AP

US President Barack Obama and British Prime Minister David Cameron walk off the stage after their joint news conference on Monday in the East Room of the White House in Washington, where they talked about various topics including Syria’s civil war.