Theresa May, U.K. prime minister, leaves number 10 Downing Street on her way to speak in the House of Commons in London, U.K., on Wednesday, March 29, 2017. The U.K. will start the clock on two years of negotiations to withdraw from the European Union on Wednesday, when Britain's ambassador hands EU President Donald Tusk a hand-signed letter from Prime Minister Theresa May invoking Article 50 of the Lisbon Treaty, the legal exit mechanism. Photographer: Jason Alden/Bloomberg via Getty Images
Theresa May, U.K. prime minister, leaves number 10 Downing Street on her way to speak in the House of Commons in London, U.K., on Wednesday, March 29, 2017. The U.K. will start the clock on two years of negotiations to withdraw from the European Union on Wednesday, when Britain's ambassador hands EU President Donald Tusk a hand-signed letter from Prime Minister Theresa May invoking Article 50 of the Lisbon Treaty, the legal exit mechanism. Photographer: Simon Dawson/Bloomberg via Getty Images
