FILE - This is a Friday, July 27, 2012   file photo of Britain's Prime Minister David Cameron, left, and the then  Mayor of London  Boris Johnson as they wait for the start of the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London. Cameron announced Friday June 24 2016 that he plans to resign following the result of Britain's EU referendum. Cameron said he would stay on for as long as was necessary for stability's sake, but that he could not be the one to lead Britain out of Europe. (AP Photo/Jae C. Hong, File)
{}