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NEW YORK, NY - SEPTEMBER 11: Republican presidental nominee Donald Trump (L) and New Jersey Gov. Chris Christie (R) attend the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)

NEW YORK, NY - SEPTEMBER 11:  Republican presidental nominee Donald Trump (L) and New Jersey Gov. Chris Christie (R) attend the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony.  (Photo by Justin Sullivan/Getty Images)