"He better be careful what he is wishing for, that I can tell you," Trump said in an interview on Fox and Friends, "That's a disgusting statement for him to make, for him to make a statement like that is a very dangerous statement."
Holder was captured on video challenging former First Lady Michelle Obama's statement that "when they go low, we go high."
"No. No," Holder said. "When they go low, we kick 'em. That's what this new Democratic party is all about," he said.
Trump cautioned Democrats to "be careful" with their rhetoric, noting that his rallies with supporters were "calm and well run."
"We don't have problems with our rallies," he said.