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

Donald Trump Jr.Donald (Don) John TrumpDem committee chairs blast Trump G-7 announcement Donald Trump Jr. hits back at critics over hypocrisy claims Kentucky governor's race tied: poll MORE slammed Senate Intelligence Chairman Richard BurrRichard Mauze BurrEx-CIA agent: Whistleblower's complaint 'should be considered on its merits' Senate Intel chair: Whistleblower hasn't agreed to testify before panel Juan Williams: Trump, the conspiracy theory president 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 campaign releases web video highlighting opposition to death penalty Sanders seeks spark from Ocasio-Cortez at Queens rally Biden seeks to fundraise off fact he's running out of money MORE (D-Calif.) and Michael BennetMichael Farrand BennetThe Hill's Campaign Report: Biden camp faces new challenges Bennet reintroduces bill to ban lawmakers from becoming lobbyists Schumer seeks focus on health care amid impeachment fever 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 TrumpFlorida GOP lawmaker says he's 'thinking' about impeachment Democrats introduce 'THUG Act' to block funding for G-7 at Trump resort Kurdish group PKK pens open letter rebuking Trump's comparison to ISIS 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 MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network MORE failed to find evidence of collusion between the president's 2016 campaign and Russia.

Sen. Lindsey GrahamLindsey Olin GrahamGraham says he shares Kurdish 'concerns' over cease-fire Majority of Americans believe Trump's Syria move has damaged US reputation: poll Senate GOP braces for impeachment trial 'roller coaster' MORE (R-S.C.) took the highly unusual step of urging the president’s son to ignore his colleague’s subpoena.