George ConwayGeorge Thomas ConwayHillicon Valley: Trump raises idea of delaying election, faces swift bipartisan pushback | Amazon, Apple, Facebook, Google release earnings reports | Senators ask Justice Department to investigate TikTok, Zoom Meme group joins with Lincoln Project in new campaign against Trump Latest Lincoln Project ad: 'It's Trump's virus now' MORE called out first lady Melania TrumpMelania TrumpThe Hill's Morning Report - Presented by Facebook - Senate GOP, House Democrats begin battle over trillion bill Melania Trump announces plans to renovate White House Rose Garden Trump tweets photo of himself wearing a mask MORE on Twitter over her criticism of an impeachment witness mentioning her and President TrumpDonald John TrumpMark Kelly clinches Democratic Senate nod in Arizona Trump camp considering White House South Lawn for convention speech: reports Longtime Rep. Lacy Clay defeated in Missouri Democratic primary 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 ConwayWatchdog group accuses Stephen Miller of violating Hatch Act with Biden comments Hillicon Valley: Trump raises idea of delaying election, faces swift bipartisan pushback | Amazon, Apple, Facebook, Google release earnings reports | Senators ask Justice Department to investigate TikTok, Zoom Meme group joins with Lincoln Project in new campaign against Trump 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) GaetzThe Hill's Morning Report - Presented by the Air Line Pilots Association - Progress slow on coronavirus bill The Hill's Morning Report - Presented by the Air Line Pilots Association - Biden VP possible next week; Meadows says relief talks 'miles apart' Hillicon Valley: House panel grills tech CEOs during much anticipated antitrust hearing | TikTok to make code public as it pushes back against 'misinformation' | House Intel panel expands access to foreign disinformation evidence MORE (R-Fla.), a President Trump ally, said the remarks made her “look mean” during the hearing. White House press secretary Stephanie GrishamStephanie GrishamMelania Trump posts video of herself wearing mask during stop at women's center Melania Trump's spokeswoman slams 'inappropriate and insensitive comments' about Barron Trump Melania Trump is 'behind-the-scenes' but 'unbelievably influential': book 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.