Former President Trump takes the stage on Aug. 5 in Columbia, South Carolina. Photo: Melissa Sue Gerrits/Getty Images
Former President Trump mocked former New Jersey Gov. Chris Christie's weight on Tuesday after Christie said President Biden had done a better job on Ukraine.
Driving the news: Trump told members of the audience not to call Christie a "fat pig," although it wasn't clear if anybody in the audience had.
- Christie responded on Twitter to Trump's comments, writing: "If you had the guts you would show up to the debate and say it to my face."
Christie previously responded to comments that Trump made about his weight by saying: "I don't care what he says about me, and I don't care what he thinks about me, and he should take a look in the mirror every once in a while — maybe he'd drop the weight thing off of his list of criticisms."
- Christie, a former close Trump ally, said in a MSNBC interview earlier on Tuesday that the U.S. has not done enough for Ukraine.
- "I think that President Biden has certainly done better than President Trump and President Trump did better than President Obama on this, we still have more to go," he said.
- Christie has also slammed the former president over his criminal indictments and said that if Trump doesn't appear at the first Republican debate, he is a "coward."
Go deeper: The GOP candidates who qualify for Fox News debate
Editor's note: This story has been updated with a response from former Gov. Chris Christie.