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U.S. President Donald Trump (L) and United Nations Secretary-General Antonio Guterres attend a Heads of States Luncheon hosted by Guterres, at the UN headquarters in New York, Sept. 19, 2017. (Xinhua/Li Muzi)

U.S. President Donald Trump (L) and United Nations Secretary-General Antonio Guterres attend a Heads of States Luncheon hosted by Guterres, at the UN headquarters in New York, Sept. 19, 2017. (Xinhua/Li Muzi)