President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE at a campaign-style rally in Topeka, Kan., Saturday night said that a fight with former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE “would not last long.”

“Remember he challenged me to a fight. ‘I’d like to take him behind the barn.’ I’d love that. That wouldn’t last long. That would not last long. That wouldn’t last long,” Trump said, imitating Biden.

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Trump pointed to his forearm and pretended to blow on Biden, who he then suggested would fall over.

“He’s down, and he’ll never get up,” Trump then said.

Biden declared at a rally in Florida in March that he would have taken Trump "behind the gym and beat the hell out of him" in high school.

The former vice president, who is himself considering a presidential run, later said he regretted the comment.

Trump later tweeted in response.

“Crazy Joe Biden is trying to act like a tough guy. Actually, he is weak, both mentally and physically, and yet he threatens me, for the second time, with physical assault. He doesn’t know me, but he would go down fast and hard, crying all the way. Don’t threaten people Joe!” he said.

Crazy Joe Biden is trying to act like a tough guy. Actually, he is weak, both mentally and physically, and yet he threatens me, for the second time, with physical assault. He doesn’t know me, but he would go down fast and hard, crying all the way. Don’t threaten people Joe! — Donald J. Trump (@realDonaldTrump) March 22, 2018

Trump was discussing Biden Saturday in the context of the Democrats who may run against him for president in 2020.