WASHINGTON (AP) — President Donald Trump and former Vice President Joe Biden are in a rhetorical smackdown over who could clean the other’s clock in a brawl.

Trump, reacting to comments Biden made about him earlier in the week at an anti-sexual assault rally, tweeted Thursday: “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!”

At the University of Miami on Tuesday, Biden cited lewd comments the Republican president made in a 2005 “Access Hollywood” tape about grabbing women without their permission.