George ConwayGeorge ConwayGeorge Conway: GOP blocking Jan. 6 commission 'more appalling' than both Trump acquittals Press: Get orange jumpsuit ready: extra large Influential Republicans detail call to reform party, threaten to form new one MORE called out first lady Melania TrumpMelania TrumpJill Biden, Kate Middleton visit school together in first meeting Jill Biden wears 'LOVE' jacket 'to bring unity' to meeting with Boris Johnson White House gets back to pre-COVID-19 normality MORE on Twitter over her criticism of an impeachment witness mentioning her and President TrumpDonald TrumpMaria Bartiromo defends reporting: 'Keep trashing me, I'll keep telling the truth' The Memo: The center strikes back Republicans eye Nashville crack-up to gain House seat MORE’s son, Barron, during the Wednesday hearing.

Stanford Law School professor Pamela Karlan made a joke about Barron’s name during her remarks.

"Contrary to what President Trump has said, Article 2 does not give him the power to do anything he wants, and I'll just give you one example that shows you the difference between him and a king, which is the Constitution says there can be no titles of nobility, so while the president can name his son Barron, he can't make him a baron," she told lawmakers on the House Judiciary Committee.

Melania Trump later criticized Karlan on Twitter, writing, “A minor child deserves privacy and should be kept out of politics. Pamela Karlan, you should be ashamed of your very angry and obviously biased public pandering, and using a child to do it.”

But George Conway, husband of White House counselor Kellyanne ConwayKellyanne Elizabeth ConwayKaren Pence confirms move back to Indiana: 'No place like home' Pence urges 'positive' agenda to counter Biden in first speech since leaving office Kellyanne Conway joins Ohio Senate candidate's campaign MORE, accused Melania Trump of amplifying Karlan’s comments, which he called a “nothingburger reference."

“So therefore you’re amplifying what was a nothingburger reference a hundred-thousand-fold. Got it,” Conway tweeted.

Karlan later apologized for her comments after Rep. Matt GaetzMatthew (Matt) GaetzKatie Hill says 'it would take a lot' to convince her to run again for House GOP divided over bills targeting tech giants Kinzinger: Conspiracy theory FBI planned Jan. 6 example of 'legacy of Trump and Trumpism' MORE (R-Fla.), a President Trump ally, said the remarks made her “look mean” during the hearing. White House press secretary Stephanie GrishamStephanie GrishamKayleigh McEnany joins Fox News as co-host of 'Outnumbered' Melania Trump says she was 'disappointed and disheartened' watching Capitol riots Trump resignations gaining steam MORE also tweeted that the comments were “classless.”

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"I want to apologize for what I said earlier about the president's son. It was wrong of me to do that," Karlan said. "I wish the president would apologize, obviously, for the things that he's done that's wrong, but I do regret having said that."

Karlan was testifying before the Judiciary Committee on Wednesday alongside three other legal scholars in the ongoing impeachment inquiry against President Trump.