British Prime Minister David Cameron, right, walks out to bid farewell to U.S. Vice President Joe Biden after their meeting at 10 Downing Street in London, Tuesday, Feb. 5, 2013. Biden

 

              British Prime Minister David Cameron, right, walks out to bid farewell to U.S. Vice President Joe Biden after their meeting at 10 Downing Street in London, Tuesday, Feb. 5, 2013.  Biden
British Prime Minister David Cameron, right, walks out to bid farewell to U.S. Vice President Joe Biden after their meeting at 10 Downing Street in London, Tuesday, Feb. 5, 2013. Biden met with Cameron on Tuesday and attended a meeting of the UK National Security Council on the final leg of his European trip. (AP Photo/Matt Dunham)