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U.S. President Donald Trump (R) and visiting Italian President Sergio Mattarella attend a joint press conference at the White House in Washington D.C., the United States, on Oct. 16, 2019. (Photo by Ting Shen/Xinhua)

U.S. President Donald Trump (R) and visiting Italian President Sergio Mattarella attend a joint press conference at the White House in Washington D.C., the United States, on Oct. 16, 2019. (Photo by Ting Shen/Xinhua)