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U.S. President Donald Trump (C) attends a signing ceremony of the United States-Mexico-Canada Agreement (USMCA) at the White House in Washington D.C., the United States, on Jan. 29, 2020. U.S. President Donald Trump on Wednesday signed the revised United States-Mexico-Canada Agreement (USMCA) in an outdoor ceremony at the South Lawn of the White House. (Xinhua/Liu Jie)