First lady Melania Trump Melania TrumpWatchdog confirms State Dept. canceled award for journalist who criticized Trump Ginsburg becomes the first woman to lie in state in the Capitol Rabbi memorializes Ginsburg: Her dissents were 'blueprints for the future' MORE in a rare tweet criticized a legal expert for mentioning her son, Barron, during testimony as part of House Democrats’ impeachment inquiry, tweeting that “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,” she tweeted Wednesday evening.

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Karlan, a Stanford Law School professor and expert witness called by House Judiciary Committee Democrats, earlier Wednesday mentioned Barron’s name while criticizing President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE’s conduct. Barron is the president’s youngest son and his only child with Melania Trump.

“Kings could do no wrong because the king’s word was law, but contrary to what President Trump says, Article II does not give him the power to do anything he wants,” Karlan said.

“The Constitution says there can be no titles of nobility, so while the president can name his son Barron, he cannot make him a baron,” she continued.

Her remarks prompted a round of rebukes from figures close to the White House.

“Only in the minds of crazed liberals is it funny to drag a 13-year-old child into the impeachment nonsense,” Trump campaign national press secretary Kayleigh McEnany said in a statement.

“Pamela Karlan thought she was being clever and going for laughs, but she instead reinforced for all Americans that Democrats have no boundaries when it comes to their hatred of everything related to President Trump,” McEnany continued.

White House press secretary Stephanie Grisham Stephanie GrishamIvana Trump on Melania as first lady: 'She's very quiet, and she really doesn't go to too many places' The Hill's 12:30 Report: Trump uses White House as campaign backdrop Coronavirus tests not required for all Melania Trump speech attendees: report MORE also called the move "classless." Melania Trump's tweet was sent when she and the president were traveling back to Washington from a NATO leaders' meeting in London.

Karlan was one of three legal scholars called by Democrats who testified Wednesday that they believed President Trump committed impeachable offenses. Republican witness, legal expert and The Hill contributor Jonathan Turley cautioned the House against moving forward with impeaching the president.

Later in Wednesday's hearing, Karlan apologized for her remarks about Barron.

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

The hearing, which was marked by partisan disagreements over President Trump’s conduct toward Ukraine, was the start of the House Judiciary Committee’s process of considering potential articles of impeachment against the president.

A House Intelligence Committee report issued Tuesday accused Trump of soliciting foreign interference from Ukraine in the 2020 election and placing "his personal political interests above the national interests of the United States."

Trump has argued he did nothing wrong in his July 25 conversation at the heart of the impeachment inquiry, during which he asked Ukraine’s president to investigate a debunked theory about Ukraine’s involvement in the 2016 Democratic National Committee hack as well as the involvement of former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE and his son Hunter Biden in Ukraine.

Trump and his allies have accused House Democrats of a partisan and unfair effort designed to wound him ahead of 2020.

—Updated at 6:02 p.m.