British Prime Minister David Cameron (R) poses for pictures with US President Barack Obama before a meeting in 10 Downing Street in central London on April 22, 2016. US President Barack Obama plunged into Britain's increasingly poisonous EU debate on Friday at the start of a visit, warning strongly against Brexit and pointing out that US soldiers had died for Europe. / AFP / Jim Watson (Photo credit should read JIM WATSON/AFP/Getty Images)
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AFP JIM WATSON