David Cameron

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**FILE** Britain Prime Minister David Cameron (center) leaves 10 Downing Street, with unidentified aides, for the House of Commons for the weekly session of Prime Minister's Question Time in the House of Commons in London on April 24, 2013. (Associated Press)

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U.S. Vice President Joseph R. Biden, left, gestures at photographers as British Prime Minister David Cameron, behind, bids him farewell after their meeting at 10 Downing St. in London, Tuesday, Feb. 5, 2013. Biden met with Cameron on Tuesday and attended a meeting of the U.K. National Security Council on the final leg of his European trip. (AP Photo/Matt Dunham)

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Britain Prime Minister David Cameron (center) speaks Jan. 18, 2013, to the House of Commons in London about the hostage situation in Algeria in this image taken from television. (Associated Press)

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Britain's Queen Elizabeth II, center, attends a cabinet meeting sat between British Prime Minister David Cameron, left, and Foreign Secretary William Hague in 10 Downing St. in London, Tuesday, Dec. 18, 2012. (AP Photo/Jeremy Selwyn, Pool)

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British Prime Minister David Cameron (left) laughs as he speaks with (from right) Finland's Prime Minister Jyrki Tapani Katainen, Croatian Prime Minister Zoran Milanovic, German Chancellor Angela Merkel and Estonia's Prime Minister Andrus Ansip during a round table meeting at an EU summit in Brussels on Dec. 13, 2012. (Associated Press)