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

Sen. Joe ManchinJoseph (Joe) ManchinOVERNIGHT ENERGY: Barrasso to seek top spot on Energy and Natural Resources Committee | Forest Service finalizes rule weakening environmental review of its projects | Biden to enlist Agriculture, Transportation agencies in climate fight Barrasso to seek top spot on Energy and Natural Resources Committee The Hill's Morning Report - Presented by the UAE Embassy in Washington, DC - Dems push McConnell on COVID-19 relief; Grassley contracts COVID-19 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 SessionsAlabama zeroes in on Richard Shelby's future Tuberville incorrectly says Gore was president-elect in 2000 Next attorney general must embrace marijuana law reforms 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 to nominate Linda Thomas-Greenfield for UN ambassador: reports Scranton dedicates 'Joe Biden Way' to honor president-elect Kasich: Republicans 'either in complete lockstep' or 'afraid' of Trump 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 RosensteinTrump turns his ire toward Cabinet members Ex-deputy attorney general says Justice Dept. 'will ignore' Trump's threats against political rivals The Hill's Morning Report - Sponsored by Facebook - Trump's erratic tweets upend stimulus talks; COVID-19 spreads in White House 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.