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

Sen. Joe ManchinJoseph (Joe) ManchinPressure mounts for national parks closure amid coronavirus White House, Senate reach deal on trillion stimulus package Some Democrats growing antsy as Senate talks drag on 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 Campaign Report: Coronavirus forces Democrats to postpone convention Roy Moore to advise Louisiana pastor arrested for allegedly defying ban on large gatherings Trump campaign demands Sessions stop implying he has president's support 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) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout 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 John TrumpMilitary personnel to handle coronavirus patients at facilities in NYC, New Orleans and Dallas Navy hospital ship USNS Comfort has total of 20 patients: report Fauci says that all states should have stay-at-home orders 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 RosensteinFull appeals court to rehear case over McGahn subpoena Graham starts closed-door depositions in FISA probe Attorney General Barr is in a mess — and has no one to blame but himself 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.