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

Sen. Joe ManchinJoseph (Joe) ManchinSchumer reelected as Senate Democratic Leader Mellman: The triumph of partisanship Senate GOP readies for leadership reshuffle 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 SessionsCongress is going to make marijuana moves Trump throws support behind criminal justice bill Bill to protect Mueller blocked in Senate 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 Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe 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 TrumpMeet the lawyer Democrats call when it's recount time Avenatti denies domestic violence allegations: 'I have never struck a woman' Trump names handbag designer as ambassador to South Africa 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 Jay RosensteinOver 1,600 lawyers sign letter saying Mueller probe must be protected Democrats in murky legal water with Whitaker lawsuits Maryland asks court to replace Whitaker with Rosenstein as acting AG 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.