Former Gov. Chris Christie, a former Trump ally during the 2020 campaign, broke with Trump over the former President's claims that the election was rigged. Christie, though, is good at debating, and he's getting under the twice-impeached guy's thin skin. Christie noted that the grift with the Trumps is "breathtaking."
Trump, who is obese, responded by calling Christie, who jumped into the 2024 race, fat in a ridiculous post and video, the latter of which is set on private, so I can't embed it here.