The senior senator from Alabama, Sen. Richard Shelby Richard Craig ShelbySenate GOP eyes early exit Dems discussing government funding bill into February GOP short of votes on Trump's controversial Fed pick MORE (R), said on Wednesday that he will likely write in a name during next month's Alabama special election rather than support GOP Senate candidate Roy Moore.

"I'll vote Republican but I will probably write in a good candidate," Shelby told reporters when asked about his plans for the Dec. 12 election.

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Senate Republicans are increasing pressure on Moore to withdraw from the race. The Republican candidate is facing multiple allegations of inappropriate sexual conduct toward teenage girls.

Shelby has called on Moore to "seriously consider" dropping out.

"Well it's not a good situation. I wish we had another candidate," Shelby added on Wednesday. Shelby endorsed 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.) in the primary race. Strange was defeated by Moore.

Moore remains defiant, saying he plans to stay in the race and that he has done nothing wrong.

It's too late for Republicans to remove Moore's name from the ballot, though leadership is exploring a potential write-in option.

Shelby didn't say whose name he would write in, but noted Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE, who left the Senate to join the administration, would be the "ideal candidate."

GOP senators are warning that if Moore wins they will be legally required to seat him. But he would likely face an ethics investigation that could pave the way for an expulsion vote.