President Trump during a Wednesday night rally invoked his 13-year-old son Barron Trump while attacking Democratic presidential candidate Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.).

“I could have Barron Trump go into Central Park and he’d get a crowd,” Trump said at the rally in Battle Creek, Mich. "He’d get a bigger crowd,” than Warren.

Trump attacked reports over Warren’s large crowd sizes and went on to tout the crowd sizes he’s had in recent weeks.

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The president's comments come after Republicans criticized a witness during the impeachment hearing for invoking Barron Trump during her testimony.

Stanford Law School professor Pamela Karlan said, “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.”

Karlan later apologized after backlash from critics, including First Lady Melania Trump who said Karlan “should be ashamed [of] using a child [for her] biased public pandering.”

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 called the comment "classless," and Rep. Matt Gaetz Matthew (Matt) GaetzSunday shows preview: Lawmakers prepare for SCOTUS confirmation hearings before election Trump faces tricky choice on Supreme Court pick Florida attorney general scrutinizing Bloomberg paying fines for felons to vote MORE (R-Fla.) told Karlan that the comment made her "look mean."