Trump Jr. slams Republican committee chairman: 'Too weak to stand up to the Democrats'

Donald Trump Jr.Donald (Don) John TrumpComedians post fake Army recruitment posters featuring Trump Jr. Trump Jr., Ivanka garner support in hypothetical 2024 poll FWS: There's 'no basis' to investigate Trump Jr.'s Mongolian hunting trip MORE slammed Senate Intelligence Chairman Richard BurrRichard Mauze BurrMarsha Blackburn shares what book she's reading during Trump Senate trial GOP senator provides fidget spinners to Senate colleagues at lunch Juan Williams: Counting the votes to remove Trump MORE (R-N.C.) Thursday for demanding that he testify on Capitol Hill.

"You have one Republican who's too weak to stand up to the Democrats," Trump Jr. told "Fox and Friends," before clarifying he was talking about Burr.

"That was a pretty, actually, bipartisan committee when I initially went in there. But the second two of them began running for the presidency against my father, that all changed."

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Sens. Kamala HarrisKamala Devi HarrisHarris on 2020 endorsement: 'I am not thinking about it right now' Panel: Is Kamala Harris a hypocrite for mulling a Joe Biden endorsement? The Hill's Morning Report — Dems detail case to remove Trump for abuse of power MORE (D-Calif.) and Michael BennetMichael Farrand BennetSunday shows preview: Lawmakers prepare for week two of impeachment trial Impeachment throws curveball in Iowa to sidelined senators Sanders says it's 'disappointing' he's not on campaign trail in Iowa MORE (D-Colo.), who are both 2020 Democratic candidates, serve on the committee.

"The Democrats want an opportunity to try to attack me," Trump Jr. added.

President TrumpDonald John TrumpKaine: Obama called Trump a 'fascist' during 2016 campaign Kaine: GOP senators should 'at least' treat Trump trial with seriousness of traffic court Louise Linton, wife of Mnuchin, deletes Instagram post in support of Greta Thunberg MORE's eldest son agreed last week to appear before the Senate Intelligence Committee for a second round of questions after receiving a subpoena from Burr.

Questions about the Trump Tower project in Moscow and the June 2016 meeting between Trump campaign officials and Russian lawyer Natalia Veselnitskaya are reportedly fair game.

Several of President Trump's staunchest allies criticized Burr for subpoenaing Trump Jr., saying it was unnecessary after special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay MORE failed to find evidence of collusion between the president's 2016 campaign and Russia.

Sen. Lindsey GrahamLindsey Olin GrahamSunday shows preview: Lawmakers prepare for week two of impeachment trial Trump defense team signals focus on Schiff Trump legal team offers brisk opening defense of president MORE (R-S.C.) took the highly unusual step of urging the president’s son to ignore his colleague’s subpoena.