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

Sen. Joe ManchinJoseph (Joe) ManchinHillicon Valley: Facebook removes Trump post | TikTok gets competitor | Lawmakers raise grid safety concerns OVERNIGHT ENERGY: Court cancels shutdown of Dakota Access Pipeline | US could avoid 4.5M early deaths by fighting climate change, study finds | Officials warn of increasing cyber threats to critical infrastructure during pandemic Officials warn of increasing cyber threats to critical infrastructure during pandemic 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 'pitcher of warm spit' — Veepstakes and the fate of Mike Pence FBI officials hid copies of Russia probe documents fearing Trump interference: book Tuberville breaks DC self-quarantine policy to campaign 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 TrumpBiden says his faith is 'bedrock foundation of my life' after Trump claim Coronavirus talks on life support as parties dig in, pass blame Ohio governor tests negative in second coronavirus test 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 RosensteinFBI officials hid copies of Russia probe documents fearing Trump interference: book Sally Yates to testify as part of GOP probe into Russia investigation Graham releases newly declassified documents on Russia probe 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.