Republican front-runner Donald Trump appeared to brag about his penis size during the GOP debate Thursday night. After the moderators asked Florida Sen. Marco Rubio about his attacks on Trump, the New York businessman responded by saying that he took issue with Rubio’s criticism of his hand size.

“I also have called him a lightweight ... and I have to take that back,” Trump said.

He added that Rubio “hit me on my hands,” referring to Rubio’s criticism that Trump was a “short-fingered vulgarian.”

Trump held up his hands and said, “Look at my hands. Are they small?” He then said Rubio implied if his hands were small, “then something else must be small. I guarantee you there’s no problem,” Trump said.

Donald defends his Trump. https://t.co/ETlpfwq3Ly — Adam Peck (@AdamReports) March 4, 2016





"Ask not what your penis can do for you, ask what your penis can do for this country." - U.S. politics, 2016. — Richard Deitsch (@richarddeitsch) March 4, 2016





For Rubio’s part, he responded to the moderator’s question by arguing that Trump deserved the attacks.

“Donald Trump has basically mocked everybody with personal attacks,” Rubio said. “If there’s anybody that ever deserved to be attacked that way, it’s Donald Trump.”

Thursday’s debate came at a critical point in the race for Trump and his rivals. After sweeping victories on Super Tuesday this week, the New York billionaire racked up enough delegates to be well on his way to the Republican presidential nomination. However, his success triggered a barrage of new attacks from members of the GOP establishment who still hope to stop a Trump candidacy.

On Super Tuesday, an anti-Trump super PAC hired former Jeb Bush spokesman Tim Miller and signaled it was getting ready to spend heavily in an attempt to stop Trump in primaries later this month. Then former presidential candidate Mitt Romney stepped up to the plate, delivering a blistering speech Thursday at the University of Utah, in which he trashed Trump’s business record, called him a “phony” and a “fraud” and implored fellow Republicans to choose anyone but the real estate mogul.

Trump responded in kind, mocking Romney’s loss in the 2012 presidential campaign and his efforts to get Trump’s endorsement during that cycle. As is his signature, Trump also tweeted insults about the former governor of Massachusetts before Romney began his speech Thursday.

Failed candidate Mitt Romney,who ran one of the worst races in presidential history,is working with the establishment to bury a big "R" win! — Donald J. Trump (@realDonaldTrump) March 3, 2016

The debate also marked Trump’s rematch with Fox News host Megyn Kelly, who was one of the moderators Thursday night. The two have not spoken since their showdown at the first GOP debate last August, when Trump said Kelly treated him unfairly after she challenged him on his previous treatment of women.