Her behaviour contrasts with how Trump reacted to hecklers in previous campaigns. In 2016 in Nevada, he said he would like to punch a protestor in the face.
“You know what they used to do to a guy like that in a place like this?” Trump said. “They’d be carried out on a stretcher, folks.”
The heckling of Ms Harris was significant because it is the first time she has been targeted over Israel’s war on Hamas, which has divided some Democrat voters.
Michigan, the state where the rally was held, has a significant number of Arab and Muslim voters.
President Joe Biden, who stepped down as a candidate in favour of Ms Harris on July 21, was regularly heckled on the campaign trail by activists decrying him as “Genocide Joe”.