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President Donald Trump and first lady Melania Trump, joined by White House staff, participate in a moment of silence on the 16th anniversary of the Sept. 11 terrorist attacks on the United States, at the White House on Sept. 11, 2017. (Olivier Douliery/Abaca Press/TNS)

President Donald Trump and first lady Melania Trump, joined by White House staff, participate in a moment of silence on the 16th anniversary of the Sept. 11 terrorist attacks on the United States, at the White House on Sept. 11, 2017. (Olivier Douliery/Abaca Press/TNS)