British Prime Minister Theresa May addresses the United Nations General Assembly on Sept. 20 in New York City. Christopher Furlong/Getty Images hide caption
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David Cameron speaks to the media on July 13 as he leaves 10 Downing St. in London after formally resigning as prime minister. Cameron announced Monday that he is resigning from his position as a member of Parliament. Frank Augstein/AP hide caption
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German Chancellor Angela Merkel (right), and British Prime Minister Theresa May (left), listen to translations during a joint news conference in Berlin on July 20. They are the two most important figures in the negotiations over Britain's departure from the European Union, the so-called Brexit. Michael Sohn/AP hide caption