David Cameron, U.K. prime minister, left, and Angela Merkel, Germany's chancellor, arrive at the annual Matthiae-Mahlzeit dinner at Hamburg's city hall in Hamburg, Germany, on Friday, Feb. 12, 2016. Cameron held talks with Merkel as part of a push to secure new European Union membership terms that he can put to U.K. voters. Photographer: Krisztian Bocsi/Bloomberg via Getty Images
