Senate Majority Leader Mitch McConnell, Alabama Sen. Richard Shelby, and several other Republican senators called on Alabama Senate candidate Roy Moore to withdraw from the race if a report that he initiated a sexual encounter with a 14-year-old girl in 1979 is true.

Leigh Corfman, now 53, says Moore began chatting with her on a bench by the Etowah County Courthouse and asked for her phone number. She claimed Moore later picked her up at her house, drove her to his home, took off her shirt and pants and touched her through her bra and panties while he was only wearing his underwear.

Three other women, who were teenage girls at the time, said Moore took them on dates but physical contact did not go beyond kissing. Moore was in his 30s at the time of the alleged incidents.

"If these allegations are true, he must step aside," McConnell said, according to Politico.

Shelby, who backed Luther Strange in the primary but did not go on to endorse Moore in the general election, agreed.

"If these allegations are true, there is no place for Roy Moore in the United States Senate," he said in a statement.

The Senate Leadership Fund, a super PAC with ties to McConnell that initially supported Strange but is now backing Moore, said the Republican candidate should be removed from the ballot "if there's a shred of evidence to these accusations."

"If there's even a shred of evidence to these accusations, Gov. Ivey and the Alabama Republican Party need to do everything in their power to remove Judge Moore from the ballot. There is no place in our party for sexual predators," the group said.

Arizona Sen. John McCain tweeted that the allegations were "deeply troubling and disqualifying."

"The allegations against Roy Moore are deeply disturbing and disqualifying. He should immediately step aside and allow the people of Alabama to elect a candidate they can be proud of," he said.

Arizona Sen. Jeff Flake shared that sentiment in a tweet:

If there is any shred of truth to the allegations against Roy Moore, he should step aside immediately. — Jeff Flake (@JeffFlake) November 9, 2017

Another potential future colleague of Moore's, Sen. Lisa Murkowski of Alaska, said she was "horrified" by the allegations and also called for Moore to withdraw if the reports are accurate.

Sen. Lisa Murkowski on Roy Moore allegations:



"I'm horrified and if it's true he should step down immediately." — NBC Politics (@NBCPolitics) November 9, 2017

Republican Sen. Cory Gardner of Colorado says, "The allegations against Alabama Senate candidate Roy Moore are deeply troubling." Gardner chairs the Republican senatorial campaign committee.

He adds, "If these allegations are found to be true, Roy Moore must drop out of the Alabama special Senate election." Sens. Pat Toomey of Pennsylvania echoed those comments, and No. 2 Senate Republican John Cornyn of Texas, who endorsed Moore, calls the report "deeply troubling."

The Associated Press contributed to this report.