David Cameron, U.K. prime minister, speaks during a news conference after a meeting of European Union (EU) leaders in Brussels, Belgium, on Tuesday, June 28, 2016. Addressing European Parliament lawmakers on Tuesday morning, Jean-Claude Juncker, president of the European Commission, said he'd ask Cameron to clarify "as soon as possible" the next steps for Britain after the vote to quit the European Union that both had sought to avert. Photographer: Jasper Juinen/Bloomberg via Getty Images