Sen. Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (D-Va.), the vice chairman of the Senate Intelligence Committee, said in a new interview that it would be “a constitutional crisis” should President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE fire special counsel Robert Mueller.

“I think it's not fair. I think it's not right. I think it's frankly cheap shots when some of these Republican colleagues would question Mueller's integrity,” Warner told CNBC.

“And if you were to see a firing, I think you would see a constitutional crisis.”

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Trump said Sunday that he is not considering firing the special counsel, which has long been a fear among Democrats. The potential for a firing garnered new concern over the weekend after a Democratic member of the House Intelligence Committee on Friday disclosed a Capitol Hill rumor that Trump would fire Mueller before Christmas.

Conservative pundits and some Republican lawmakers have questioned the integrity of the special counsel and suggested there is a bias within the FBI, citing anti-Trump messages sent by an agent formerly working on the Russia investigation.

Mueller reportedly fired the agent, Peter Strzok, after learning about the messages.

Warner added that firing Mueller would be “a political disaster” for Trump.

Warner, who as the vice chairman of the Senate Intelligence Committee is charged with overseeing the panel’s own investigation into Russia’s election meddling, said he believes the probe will be complete in a year.

“I mean, if this president allows this investigation to come to its conclusion and either bring charges or not, then I think the system will have worked as our founders intended,” Warner told CNBC.