Moore's condemnation last night of a Washington Post story during a campaign speech in Huntsville, Alabama, came hours after another fellow Republican, Senator Pat Toomey of Pennsylvania, urged him to drop out of a special election for one of Alabama's Senate seats.
Toomey said Moore's explanations had been inadequate and that Republicans should consider Senator Luther Strange as a write-in candidate to run against Moore. Strange lost the Republican primary to Moore.
He told supporters, "I'm counting on you to stand with me at this critical moment by chipping in a donation to help me bust through the vicious lies and attacks and get the truth out to as many voters as possible before December 12."
The Post story quoted four women by name, including the woman who alleged the sexual contact at 14, and had two dozen other sources.
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In a Huntsville gym, Moore assured supporters that the Post story was "a desperate attempt to stop my political campaign" and that the allegations that he was "involved with a minor child are completely unfalse and untrue and for which they will be sued," drawing a round of applause.
"Why would they come now? Because there are groups that don't want me in the United States Senate," he said, naming the Democratic Party and the Republican establishment and accusing them of working together. He added, "We do not plan to let anybody deter us from this race."
Toomey did not rule out the possibility that Senate Republicans might work to unseat Moore if he wins the special election against Democrat Doug Jones.
The White House, pointedly noting that President Donald Trump did not back Moore during the primary, said Trump will likely weigh in on the Senate race when he returns from Asia later this week. The White House has already made clear that Moore should step aside if the allegations are proven to be true.
"But, having said that, he hasn't been proved guilty," Short added. "We have to afford him the chance to defend himself."
Moore is an outspoken Christian conservative and former state Supreme Court judge. The Post reported last Thursday that he had sexual contact with a 14-year-old girl and pursued three other teenagers decades earlier.
While he called the allegations "completely false and misleading," in an interview with conservative radio host Sean Hannity he did not wholly rule out dating teenage girls when he was in his early 30s. Asked if that would have been usual for him, Moore said, "Not generally, no."