Article continues below advertisementBefore heading to New York for a Yankees game to honor the 24th anniversary of 9/11, President Donald Trump, 79, fielded questions from reporters outside of the White House.When asked about the death of Charlie Kirk, 31, who was shot and killed during his American Comeback Tour at Utah Valley University on Wednesday, September 10, Trump revealed he has an "indication" of the killer's motive, adding, "We'll let you know about that later.