Theresa May, U.K. prime minister and leader of the Conservative Party, arrives to speak during the first day of the party's annual conference in Birmingham, U.K., on Sunday, Oct. 2, 2016. May said she'll begin the U.K.'s withdrawal from the European Union in the first quarter of 2017 in her clearest announcement yet about her government's Brexit strategy. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Theresa May, U.K. prime minister and leader of the Conservative Party, arrives to speak during the first day of the party's annual conference in Birmingham, U.K., on Sunday, Oct. 2, 2016. May said she'll begin the U.K.'s withdrawal from the European Union in the first quarter of 2017 in her clearest announcement yet about her government's Brexit strategy. Photographer: Chris Ratcliffe/Bloomberg via Getty Images