No. 2 Senate Republican: ‘Big mistake’ to fire Mueller 
© Greg Nash

Sen. John CornynJohn CornynBiden-McConnell cold war unlikely to end at White House There will be no new immigration law under Biden, unless he changes course Tim Scott sparks buzz in crowded field of White House hopefuls MORE (R-Texas) warned on Tuesday that it would be a “big mistake” for President TrumpDonald TrumpKinzinger, Gaetz get in back-and-forth on Twitter over Cheney vote READ: Liz Cheney's speech on the House floor Cheney in defiant floor speech: Trump on 'crusade to undermine our democracy' MORE to fire special counsel Robert MuellerRobert (Bob) MuellerWhy a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel CNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump MORE and predicted it would not happen.

“I don't think the president's going to fire him because I think it would be a big mistake,” he told The Hill.

Pressed on the consequences, the No. 2 Senate Republican urged Trump to let Mueller continue his probe into Russia's meddling in the 2016 election and potential collusion between the Trump campaign and Moscow. 

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“I don't think he or I or anybody could predict what the consequences might be, but there would be a lot of backlash, so I think he should just let Mr. Mueller do his job,” he said. 

Cornyn was one of several Republicans on Tuesday who doubled down on warnings that Trump leave Mueller alone.

Sen. Chuck GrassleyChuck GrassleyOn The Money: Biden says workers can't turn down job and get benefits | Treasury launches state and local aid | Businesses jump into vax push Grassley criticizes Biden's proposal to provide IRS with B The Hill's Morning Report - Presented by Facebook - Infrastructure, Cheney ouster on deck as Congress returns MORE (R-Iowa), chairman of the Judiciary Committee, said it would be “suicide” to fire the former FBI director. Sen. Thom TillisThomas (Thom) Roland TillisSenate hears from Biden's high-profile judicial nominees for first time Senate Democrats take aim at 'true lender' interest rate rule Former North Carolina chief justice launches Senate campaign MORE (R-N.C.), downplaying Trump’s comments, told CNN that “thematically, he has said similar things before.”

Cornyn separately told reporters that lawmakers have warned the White House that it would be a mistake to fire Mueller.

“I think it's pretty universally being conveyed,” he said. 

Trump is lashing out after the FBI raided Michael Cohen's offices and hotel room reportedly off a referral from Mueller's team. 

“Attorney–client privilege is dead!” Trump said in a tweet, adding: “A TOTAL WITCH HUNT!!!”

He said Monday that “many people” had said he should fire Mueller.

But doing so would cause a tremendous storm in Washington with consequences that could fall on Republicans in the midterm elections, which are taking center stage on Capitol Hill.

Republicans are increasingly worried about holding onto their House majority in an election season likely to be defined by Trump. They have a much better chance of holding the majority in the Senate, because Democrats are defending more than twice as many seats as the GOP.

Senators have introduced two bills that would limit Trump and the Justice Department's ability to fire Mueller. But GOP leadership has downplayed the need for the legislation because they don’t believe Trump will fire Mueller.