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Netherlands' Prime Minister Mark Rutte (L) poses next to British Prime Minister David Cameron at his official residence in The Hague, on May 28, 2015. Cameron is intensifying his lobbying of EU leaders over his plans to renegotiate the terms of Britains EU membership by embarking on a two-day tour of four European capitals. AFP PHOTO/ANP REMKO DE WAAL (Photo credit should read REMKO DE WAAL/AFP/Getty Images)

Netherlands' Prime Minister Mark Rutte (L) poses next to British Prime Minister David Cameron at his official residence in The Hague, on May 28, 2015. Cameron is intensifying his lobbying of EU leaders over his plans to renegotiate the terms of Britains EU membership by embarking on a two-day tour of four European capitals. AFP PHOTO/ANP REMKO DE WAAL        (Photo credit should read REMKO DE WAAL/AFP/Getty Images)