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President Donald Trump, left, first lady Melania Trump, Defense Secretary James Mattis, and Joint Chiefs Chairman Gen. Joseph Dunford, attend the September 11th Pentagon Memorial Observance at the Pentagon on the 16th anniversary of the September 11th attacks, Monday, Sept. 11, 2017. © AP Image

President Donald Trump, left, first lady Melania Trump, Defense Secretary James Mattis, and Joint Chiefs Chairman Gen. Joseph Dunford, attend the September 11th Pentagon Memorial Observance at the Pentagon on the 16th anniversary of the September 11th attacks, Monday, Sept. 11, 2017. © AP Image