First lady Melania Trump said Stanford Law Professor Pamela Karlan, who testified at Wednesday’s impeachment hearing, "should be ashamed” for invoking her 13-year-old son’s name as the butt of a joke during testimony.

Karlan used Barron Trump’s name to illustrate her point that President Trump can’t rule like a king.

"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," Karlan said in the committee room, prompting chuckles across the room.

“A minor child deserves privacy and should be kept out of politics,” the first lady tweeted."Pamela Karlan, you should be ashamed of your very angry and obviously biased public pandering, and using a child to do it."