MADRID, SPAIN - OCTOBER 13:  British Prime Minister Theresa May (L) meets Spanish caretaker Prime Minister Mariano Rajoy (R) at Moncloa Palace on October 13, 2016 in Madrid, Spain. May's visit to Rajoy is part of a tour around Europe holding meetings with the main EU country leaders to discuss the impact of Brexit. Spain host the most British expats in the European Union.  (Photo by Pablo Blazquez Dominguez/Getty Images)