Senate Dem: Firing Mueller a red line Trump 'cannot cross'

Sen. Mark WarnerMark Robert WarnerHillicon Valley: North Korean IT firm hit with sanctions | Zuckerberg says Facebook better prepared for midterms | Big win for privacy advocates in Europe | Bezos launches B fund to help children, homeless Bipartisan trio asks US intelligence to investigate ‘deepfakes’ Warner: 'overwhelming majority' of Republicans would back social media regulations MORE (D-Va.) on Thursday warned that firing special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE is a line that President TrumpDonald John TrumpOver 100 lawmakers consistently voted against chemical safeguards: study CNN's Anderson Cooper unloads on Trump Jr. for spreading 'idiotic' conspiracy theories about him Cohn: Jamie Dimon would be 'phenomenal' president MORE "cannot cross" following new reports that Trump ordered the White House counsel to fire Mueller last year.

“I’ve said it before, and I am saying it again: firing the Special Counsel is a red line that the President cannot cross," Warner said in a statement reacting to a bombshell report by The New York Times that Trump attempted to fire Mueller last summer.

Trump, who has repeatedly blasted the special counsel's probe into ties between the Trump campaign and Russia as a "witch hunt," reportedly backed down last June after White House counsel Don McGahn threatened to resign. 

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"Any attempt to remove the Special Counsel, pardon key witnesses, or otherwise interfere in the investigation, would be a gross abuse of power, and all members of Congress, from both parties, have a responsibility to our Constitution and to our country to make that clear immediately," Warner said Thursday. 

Warner is the top Democrat on the Senate Intelligence Committee, which is conducting its own investigation into Russian meddling. The Virginia senator has repeatedly criticized Trump for being "unwilling" to recognize the security threat posed by Russia. 

Mueller reportedly learned of Trump's attempt to fire him, a move long cautioned against  by both Republicans and Democrats in Congress, and is now investigating top officials from Trump's administration who are currently in office or who left over the past year.