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NEW YORK, NY - SEPTEMBER 20: British Prime Minister Theresa May addresses the United Nations General Assembly on September 20, 2016 in New York City on September 20, 2016 in New York City. World leaders have gathered in New York for the 71st session of the UN General Assembly. The annual gathering is an opportunity for a number of high-level meetings, sideline bilaterals and think tank addresses concerning global issues. (Photo by Christopher Furlong/Getty Images)

NEW YORK, NY - SEPTEMBER 20:  British Prime Minister Theresa May addresses the United Nations General Assembly on September 20, 2016 in New York City on September 20, 2016 in New York City. World leaders have gathered in New York for the 71st session of the UN General Assembly. The annual gathering is an opportunity for a number of high-level meetings, sideline bilaterals and think tank addresses concerning global issues.  (Photo by Christopher Furlong/Getty Images)