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Manchin: We're 'on the verge' of a constitutional crisis due to Sessions's firing

Sen. Joe ManchinJoe ManchinSchumer vows to advance two-pronged infrastructure plan next month Senators say White House aides agreed to infrastructure 'framework' Briahna Joy Gray: Biden is keeping the filibuster to have 'a Joe Manchin presidency' MORE (D-W.Va.) said Thursday that the U.S. is on the "verge" of a constitutional crisis because of the forced resignation of Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsThe Hill's Morning Report - After high-stakes Biden-Putin summit, what now? Border state governors rebel against Biden's immigration chaos Garland strikes down Trump-era asylum decisions MORE

"I think it’s a big mistake to let Sessions go," Manchin, who was the only Democratic senator to vote to confirm the former attorney general, said on "CBS This Morning."

Manchin pointed to the potential ramifications Sessions's ouster could have on special counsel Robert MuellerRobert (Bob) MuellerSenate Democrats urge Garland not to fight court order to release Trump obstruction memo Why a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel MORE's investigation into Russia's election interference to back up his claim. 

His comments came just a day after Sessions formally resigned from his role at the Department of Justice at President TrumpDonald TrumpIran claims U.S. to lift all oil sanctions but State Department says 'nothing is agreed' Ivanka Trump, Kushner distance themselves from Trump claims on election: CNN Overnight Defense: Joint Chiefs chairman clashes with GOP on critical race theory | House bill introduced to overhaul military justice system as sexual assault reform builds momentum MORE's request. Trump announced on Twitter on Wednesday that Matthew Whitaker, Sessions's chief of staff, will serve as acting attorney general. 

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Whitaker, who has publicly criticized certain elements of the Mueller investigation, will now oversee it.

Deputy Attorney General Rod RosensteinRod RosensteinHouse Judiciary to probe DOJ's seizure of data from lawmakers, journalists The Hill's Morning Report - Biden-Putin meeting to dominate the week Media leaders to meet with Garland to discuss leak investigations MORE had been overseeing the probe since Sessions recused himself in early 2017. 

Democratic lawmakers, including Manchin, have criticized Whitaker's oversight of the Mueller probe.

"What raises my concerns is a person that's been so vocal against the investigation that was going on is [put] in charge a day after the [midterm] election," Manchin told CBS. "I think that gives concern to every senator, Democrat and Republican. We are a country — the rule of law is everything.

"Looking like it's been tilted one way or the other is wrong."

Trump has repeatedly called the Russia investigation a "witch hunt," and on Wednesday said that he could fire everyone in Mueller's office if he wanted. He said he would not take that step for political reasons, however.