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The lawyer, Vinicio Castillo Semán, said at a news conference on Monday that the woman, identified as Nexis de los Santos, 23, had said in a sworn statement not only that she had never gone "to bed with" Mr. Menendez, but also that she had never met him.

On Monday, Senator Menendez, a Democrat, said, "I've always said that these are all false, they're smears, and so I look forward to seeing whatever the Dominican courts have that prove what I've said all along."

Mr. Castillo has been accused of hosting outings on his yacht in which Mr. Menendez had sex with prostitutes. He has strongly denied the allegations and said he would seek a criminal probe into the source of the reports. On Monday, Mr. Castillo distributed copies of the woman's statement. The woman did not attend.

According to Mr. Castillo, the woman claims that she and a friend were approached by another Dominican lawyer who manufactured the accusations against Mr. Menendez.

That lawyer, Melanio Figueroa, could not be reached directly for comment. Last month, an assistant at the lawyer's office said it had dropped the women's case.

The video was recorded without their consent, Mr. Castillo said.

In the video, the two women also claimed they had had sex with Mr. Castillo and Dr. Salomon E. Melgen, a Florida eye doctor who is a prominent Democratic campaign contributor.

Mr. Castillo has said he has known Mr. Menendez for some 15 years and has never seen him with a prostitute. He said he had never hosted any parties involving prostitutes.

In November, the Web site The Daily Caller published an article that included a video interview with two women who claimed to be prostitutes.