Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) on Monday called for GOP Senate candidate Roy Moore to "step aside."

"I think he should step aside," McConnell said during a tax reform press conference in Louisville, Ky., when asked about the calls from his Senate colleagues for Moore to leave the race.

Moore has been under growing pressure from Republicans to drop out of the Senate race after The Washington Post published a story containing allegations that Moore pursued relationships with teenage girls.

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When pressed about the allegations, McConnell said, "I believe the women."

The Post's story last week detailed an account from Leigh Corfman, now 53, who said she had a sexual encounter with Moore in 1979, when she was 14 years old and he was 32.

The report also included accounts from three other women who said Moore attempted to court them around that time, when they were between 16 and 18 years old.

Moore in a tweet early Monday afternoon said McConnell is the person who should step aside.

“He has failed conservatives and must be replaced,” Moore said, using the hashtag “DrainTheSwamp.”

The person who should step aside is @SenateMajLdr Mitch McConnell. He has failed conservatives and must be replaced. #DrainTheSwamp — Judge Roy Moore (@MooreSenate) November 13, 2017

Even if Moore withdraws from the Senate race — something he has said he will not do — Republicans are stuck with his name remaining on the ballot.

The deadline for the party to remove Moore's name from the ballot passed in October, though Republicans could mount a write-in challenge. Republicans have also floated trying to move back the December special election date.

McConnell said Monday that the party is exploring a write-in bid, though he declined to say specifically who would be the candidate.

"That's an option we're looking at, whether or not there is someone who could mount a write-in successfully," he said.

Pressed if Sen. Luther Strange Luther Johnson StrangeSessions hits back at Trump days ahead of Alabama Senate runoff The biggest political upsets of the decade State 'certificate of need' laws need to go MORE (R-Ala.), who Moore defeated in the GOP primary runoff, would be the write-in candidate, McConnell added: "We'll see."

Moore has denied wrongdoing and threatened to sue the Post, arguing the story is politically motivated and aimed at damaging him ahead of the December special election.

McConnell and dozens of Senate Republicans immediately called on Moore to step aside last week "if these allegations are true."

GOP Sens. Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE (Utah) and Susan Collins Susan Margaret CollinsJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally Momentum growing among Republicans for Supreme Court vote before Election Day MORE (Maine) quickly backed McConnell's remarks Monday, with Hatch floating Strange as an alternative.

"I stand with the Majority Leader on this. These are serious and disturbing accusations, and while the decision is now in the hands of the people of Alabama, I believe Luther Strange is an excellent alternative," Hatch said in a tweet.

I have now read Mr. Moore’s statement and listened to his radio interview in which he denies the charges. I did not find his denials to be convincing and believe that he should withdraw from the Senate race in Alabama. — Sen. Susan Collins (@SenatorCollins) November 13, 2017

Sen. Cory Gardner Cory Scott GardnerJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' MORE (R-Colo.), who leads the Senate GOP campaign arm, later called on the Senate to expel Moore if Moore wins December's special election.

"I believe the individuals speaking out against Roy Moore spoke with courage and truth, proving he is unfit to serve in the United States Senate and he should not run for office," Gardner said in a statement.

"If he refuses to withdraw and wins, the Senate should vote to expel him, because he does not meet the ethical and moral requirements of the United States Senate."

Republicans are increasingly retreating from the Alabama Senate candidate after he said during an interview on Sean Hannity's radio show that he may have dated girls in their late teens at that time in his life.

Moore added that he did not “remember anything like that" and maintained that there was no inappropriate sexual behavior.

Despite the blowback nationally from Republican officials and lawmakers, Alabama Republicans have publicly defended Moore and warned that if he left the race it would hand the Senate seat to Democratic candidate Doug Jones.

Alabama Republican Party Chairwoman Terry Lathan also pushed back against a write-in campaign, telling the Alabama Political Reporter that "it would be a serious error for any current elected GOP official or candidate to publicly endorse another party's candidate, an independent, a third party or a write-in candidate in a general election as well."

Moore is using the blowback from Republican lawmakers in his fundraising appeals, saying that "establishment Republicans are colluding with the Obama-Clinton Machine."

"Apparently Mitch McConnell and the establishment GOP would rather elect a radical pro-abortion Democrat than a conservative Christian as the next U.S. Senator from Alabama," Moore said in an email to supporters on Sunday night.

Republicans have a slim 52-seat majority in the Senate and have struggled to unite the caucus behind key agenda items, including repealing ObamaCare.

Though Moore has railed against Senate leadership as part of his campaign, losing the seat to a Democrat would likely make it harder for McConnell to get major legislation through the chamber.

– Updated at 3:31 p.m.