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

Donald Trump Jr.Donald (Don) John TrumpTrump remarks deepen distrust with intelligence community Lieu trolls Trump with 'warning' to foreign powers on office door Lieu trolls Trump with 'warning' to foreign powers on office door MORE slammed Senate Intelligence Chairman Richard BurrRichard Mauze BurrElection security bills face GOP buzzsaw Election security bills face GOP buzzsaw Tillis dodges primary challenge in NC 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 HarrisThe generational divide of Joe Biden and the Democratic Party 2020 Democrats mark 7th anniversary of DACA 2020 Democrats mark 7th anniversary of DACA MORE (D-Calif.) and Michael BennetMichael Farrand BennetDemocratic presidential hopefuls react to debate placement Democratic presidential hopefuls react to debate placement The Hill's 12:30 Report — Presented by MAPRx — Biden, Sanders to share stage at first DNC debate 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 TrumpTrump defends Stephanopolous interview Trump defends Stephanopolous interview Buttigieg on offers of foreign intel: 'Just call the FBI' 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 MuellerKamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump MORE failed to find evidence of collusion between the president's 2016 campaign and Russia.

Sen. Lindsey GrahamLindsey Olin GrahamElection security bills face GOP buzzsaw Election security bills face GOP buzzsaw House Intel Republican: 'Foolish' not to take info on opponent from foreign ally MORE (R-S.C.) took the highly unusual step of urging the president’s son to ignore his colleague’s subpoena.