FILE - In this Wednesday, Dec. 2, 2015 file photo, British Prime Minister David Cameron leaves 10 Downing Street in London, to go to the Houses of Parliament. Prime Minister David Cameron's office says he will look into a lawmaker's claim that U.S. officials prevented a British Muslim family from flying to Disneyland for a planned holiday on Dec. 15, 2015. (AP Photo/Matt Dunham, File)
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