George ConwayGeorge Thomas ConwayGeorge Conway on Trump adding Dershowitz, Starr to legal team: 'Hard to see how either could help' George Conway group drops ad seeking to remind GOP senators of their 'sworn oaths' ahead of impeachment trial Trump suggests LBJ is in hell: 'He's probably looking down — or looking up' MORE called out first lady Melania TrumpMelania TrumpThe Hill's 12:30 Report: Trump beefs up impeachment defense with Dershowitz, Starr Trump welcomes LSU to the White House: 'Go Tigers' The Hill's Morning Report — President Trump on trial MORE on Twitter over her criticism of an impeachment witness mentioning her and President TrumpDonald John TrumpTrump rails against impeachment in speech to Texas farmers Trump administration planning to crack down on 'birth tourism': report George Conway on Trump adding Dershowitz, Starr to legal team: 'Hard to see how either could help' 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 ConwayGeorge Conway on Trump adding Dershowitz, Starr to legal team: 'Hard to see how either could help' White House pushes back on Parnas allegations Trump suggests LBJ is in hell: 'He's probably looking down — or looking up' 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) GaetzGaetz in Twitter battle with Florida House Republican Apple under pressure to unlock Pensacola shooter's phones Conservatives slam Warren's call to put transgender women in women's prisons MORE (R-Fla.), a President Trump ally, said the remarks made her “look mean” during the hearing. White House press secretary Stephanie GrishamStephanie GrishamHill.TV's Saagar Enjeti on impeachment: 'CNN can see through this nonsense' The Hill's 12:30 Report: Senate receives impeachment articles as trial opens Republicans criticize Pelosi for gifting pens used to sign impeachment articles 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.