He revealed her identity as Julie Swetnick on Wednesday.
The most explosive of Swetnick's allegations, though, is a claim that she witnessed efforts by Judge, Kavanaugh "and others to "target" particular girls" using spiked punch "so they could be taken advantage of".
In her declaration, Swetnick recounts an alleged incident in approximately 1982 in which she says she was the victim of a "gang rape" at which Kavanaugh was present.
Avenatti also told reporters the woman, whom he did not name, has multiple security clearances and will "literally risk her life" by coming forward.
He is scheduled to testify before the Senate Judiciary Committee on Thursday, following the testimony of another of his accusers, Christine Blasey Ford.
Brett Kavanaugh accuser rejects hearing for now
The party controls the Senate 51-49 and the Judiciary panel by 11-10, so it can not afford GOP "no" votes. What are Ford's lawyers saying? "Someone who is lying does not ask the FBI to investigate her claims".
She said Kavanaugh's "recent claim on Fox News regarding his alleged "innocence" during his high school years and lack of sexual activity" is "absolutely false and a lie". Regarding alcohol, he said he never drank so much that he could not remember what happened the night before.
Swetnick said she's "one of the first 100 women in the world to achieve a Microsoft Certified Systems Engineering Certification".
He also sent the statement to the committee on Wednesday, calling for the confirmation process again to be delayed.
But the allegations have left some Republican senators - especially two women who have spoken out in the past about sexual abuse of women - under pressure to weigh the accusers' stories. She said she has a "firm recollection of boys lined up outside rooms at many of these parties waiting for their "turn" with a girl inside the room". "Somebody yelled down the hall, 'Brett Kavanaugh just put his penis in Debbie's face, '" she said. He tweeted a screenshot of the email on Sunday evening after announcing he was representing "a woman with credible information" about Kavanaugh and Judge.
"This morning Michael Avenatti provided a declaration to the Judiciary Committee". Kavanaugh has denied all the allegations. While she did not accuse Kavanaugh of assaulting her, she claimed she witnessed him participate in gang rapes.