U.S. President Barack Obama, right, shakes hands with David Cameron,... News PhotoBarack Obama,British Culture,David Cameron - Politician,East Room,England,Foreign Affairs,Global Business,Government,Hand,Handshake,Horizontal,International Landmark,North America,Politics,Press Conference,Prime Minister,The Americas,UK,US President,USA,Washington DC,White House - Washington DCPhotographer Collection: Bloomberg 2013 BloombergU.S. President Barack Obama, right, shakes hands with David Cameron, U.K. prime minister, during a news conference in the East Room of the White House in Washington, D.C., U.S., on Monday, May 13, 2013. President Barack Obama said his administration made no attempt to cover up or downplay the involvement of terrorists in last year's deadly attack on a U.S. outpost in Benghazi, Libya, and said the congressional investigation has turned into a 'political circus.' Photographer: Andrew Harrer/Bloomberg via Getty Images