MADRID, SPAIN - SEPTEMBER 04:  British Prime Minister David Cameron (L) and Spanish Prime Minister Mariano Rajoy (R) chat as they walk at Moncloa Palace on September 4, 2015 in Madrid, Spain. David Cameron is visiting Spain and Portugal as part of a tour to seek for support from fellow European leaders to go along with a renegotiation of Britain's EU membership. Rajoy and Cameron are also expect to talk about the refugees crisis the European Union is facing.  (Photo by Pablo Blazquez Dominguez/Getty Images)