Former George W. Bush administration aide Tony Fratto said Wednesday that if Republicans allow Alabama Senate candidate Roy Moore to serve despite the serious sexual assault allegations against him, then the GOP is "over."

"We can scream our heads off all we want, Alabama voters will do whatever they do," Fratto tweeted. "The real test for the GOP is whether Moore is allowed to serve, should he win. Fail that test and the party's over."

We can scream our heads off all we want, Alabama voters will do whatever they do. The real test for GOP is whether Moore is allowed to serve, should he win. Fail that test and the party’s over. — Tony Fratto (@TonyFratto) November 22, 2017

Fratto, formerly the deputy assistant and deputy press secretary for Bush, is a longstanding critic of President Trump.

Trump all but gave his endorsement of Moore on Tuesday despite the stories of nine women accusing him of misconduct.

"We don't need a liberal person in there, a Democrat,” Trump told reporters on the South Lawn of the White House.

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Moore has denied all the allegations and has indicated he has no intention to step down ahead of the Dec. 12 special election for Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE's former seat.

The former aide's comments come after a new poll found that a majority of voters surveyed believe Moore should be expelled from the Senate if he is elected in December.