A fourth Republican senator announced Thursday that he would oppose Herman Cain if President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE nominated him to the Federal Reserve Board, all but dooming his potential appointment.

Sen. Kevin Cramer Kevin John CramerMomentum growing among Republicans for Supreme Court vote before Election Day On Paycheck Protection Program, streamlined forgiveness is key McConnell shores up GOP support for coronavirus package MORE (R-N.D.), a close Trump ally, told reporters that “if I had to vote right now, there's no way I could vote for” Cain. The president had floated the businessman for the Fed board last week.

Cramer’s opposition makes him the fourth Republican to denounce Cain’s potential nomination, effectively ending Cain's chance at confirmation. GOP Sens. Lisa Murkowski Lisa Ann MurkowskiSenate GOP aims to confirm Trump court pick by Oct. 29: report Senate GOP sees early Supreme Court vote as political booster shot Pence defends Trump's 'obligation' to nominate new Supreme Court justice MORE (Alaska), Cory Gardner (Colo.) and Mitt Romney Willard (Mitt) Mitt RomneySenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (Utah) all came out against Cain on Wednesday.

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With four of the 53 Senate Republicans opposed to Cain, he would not reach the necessary 51 votes for confirmation without getting support from Democrats, which is unlikely.

Cramer, a member of the Senate Banking Committee, cited the four allegations of sexual harassment made against Cain that helped derail his 2012 Republican presidential campaign.

“It's hard for me to get over the harassment allegations from the past,” Cramer said. “His showmanship doesn't bother me. His business experience, I think, is great. Simplifying the tax code is fine by me. But character still does matter.

“I know more things about him that would keep him out than would get him in,” Cramer added. "I'd be happy to go through the whole vetting process, but it's so uphill it's hard for me to see him getting up there."

Four women who worked for Cain at the National Restaurant Association, a Washington trade group he led from 1996 to 1998, accused him of sexual harassment. Cain has denied all of the allegations but reached financial settlements with two of his accusers.

Larry Kudlow, Trump's top economic adviser, had said earlier Thursday during The Hill's Newsmaker Series that the president continued to support Cain despite the opposition from GOP senators the previous day.

"As the president said yesterday, he continues to support [Cain] and we’ll see how that turns out,” Kudlow said. “He’s in the process; we’ll let him go through it, the president insists on that.”

Trump and White House officials have said that Cain's nomination was contingent on a background check conducted by the FBI, which is part of the standard vetting process for presidential nominees.

Trump told reporters Wednesday that Cain is a “wonderful man,” but acknowledged doubts about the viability of his nomination amid opposition from some Republicans.

“He's been a supporter of mine for a long time,” Trump said. “As to how he's doing in the process, that I don’t know. You go through a process. But Herman is a great guy, and I hope he does well."

Republican senators have asked Trump in public and private to reconsider any plans to nominate Cain, due to allegations of sexual harassment and his leadership of a super PAC supporting the president's reelection.

Cain himself said last week that he was unsure if he would survive the "cumbersome" White House vetting process, but relished the chance to defend himself.

“Let them go back and dig up eight-year-old stuff,” Cain said in a video posted to his Facebook page Friday. “I will be able to explain this time where they wouldn’t let me explain it last time. They were too busy believing the accusers.”

--Updated at 3:02 p.m.