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

Donald Trump Jr.Donald (Don) John TrumpDick Cheney to attend fundraiser supporting Trump reelection: report House chairman warns foreign governments to 'cease and desist' spending money at Trump properties Chris Cuomo: 'I should be better than the guys baiting me' MORE slammed Senate Intelligence Chairman Richard BurrRichard Mauze BurrHoekstra emerges as favorite for top intelligence post Trump casts uncertainty over top intelligence role Trump withdraws Ratcliffe as Intelligence pick 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 HarrisJoe Biden faces an uncertain path Biden: 'There's an awful lot of really good Republicans out there' Fighter pilot vs. astronaut match-up in Arizona could determine control of Senate MORE (D-Calif.) and Michael BennetMichael Farrand BennetThe Hill's Campaign Report: Battle for Senate begins to take shape The Hill's Morning Report — Recession fears climb and markets dive — now what? Hickenlooper expected to end presidential bid on Thursday 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 TrumpO'Rourke: Trump driving global, U.S. economy into recession Manchin: Trump has 'golden opportunity' on gun reforms Objections to Trump's new immigration rule wildly exaggerated 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 MuellerTrump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony Kellyanne Conway: 'I'd like to know' if Mueller read his own report MORE failed to find evidence of collusion between the president's 2016 campaign and Russia.

Sen. Lindsey GrahamLindsey Olin GrahamGraham warns Trump on Taliban deal in Afghanistan: Learn from 'Obama's mistakes' Appropriators warn White House against clawing back foreign aid Trump meets with national security team on Afghanistan peace plan MORE (R-S.C.) took the highly unusual step of urging the president’s son to ignore his colleague’s subpoena.