Joe Biden hit back at a reporter who asked him whether calling an Iowa voter a "damn liar" was comparable to rhetoric from President Trump.

"No, no, no, no, no, don't compare me to Donald Trump. Don't do that," the former vice president shot back at an NPR reporter when she made the comparison Saturday. Biden said Trump makes fun of people and lies, adding, "I don't do any of those things."

"The fact of the matter is this guy stood up, and he was, in fact, lying. And I just pointed out, 'You're a liar.' It's a fact," he said.

Biden, 77, said he might regret challenging the guy to a push-up contest but said he thought it was "civil" to call him a liar. The Delaware Democrat had previously pushed back at critics who thought he called the Iowa voter "fat," claiming instead he used the word "fact."

The exchange with the voter came during a campaign stop in Iowa, where a retired farmer stood up and accused Biden of being too old to be president while also questioning his son's work in Ukraine. The exchange went viral, and the voter has since said that Biden should drop out of the race.