(CBS News/CNN) -- Washington, D.C. resident Julie Swetnick accused Supreme Court nominee Brett Kavanaugh and his high school friend Mark Judge of sexual misconduct in a document tweeted by her attorney, Michael Avenatti, on Wednesday. Swetnick is the third woman to come forward with allegations of sexual assault against Kavanaugh in the past month.
While Swetnick does not accuse Kavanaugh of assaulting her, she does allege that he and his friend Mark Judge were present at a party when she was gang raped by a series of boys after her drink was spiked.
Swetnick also says that Judge and Kavanaugh were among the boys who, at other parties in the early 1980s, spiked drinks in order to disorient girls and take advantage of them sexually.
Senate Judiciary Chairman Chuck Grassley said that Thursday's hearing with Kavanaugh and Christine Blasey Ford would go forward as planned even as the new allegations surfaced Wednesday against the Supreme Court nominee.
Grassley, an Iowa Republican, told reporters that while they are investigating the new allegation, there will not be a delay of the pre-scheduled hearing, saying "tomorrow is very important."
A Grassley spokesman later reiterated the hearing will go on as scheduled.
Ford has accused Kavanaugh of sexual and physical assault during their high school years at a party in the early 1980s. Another woman, Deborah Ramirez, claims Kavanaugh exposed himself to her when they were both freshmen at Yale during a dorm party while they were both intoxicated.
Kavanaugh immediately and vehemently rejected the newest accusation, saying in a statement, "This is ridiculous and from the Twilight Zone. I don't know who this is and this never happened."
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Swetnick, who attended high school in Gaithersburg, Md. at the same time as Kavanaugh, says in a declaration posted by Avenatti that Kavanaugh, his friend Mark Judge, and others, in 1981-1982 used to "'spike' the 'punch' at house parties I attended with drugs and/or grain alcohol so as to cause girls to lose their inhibitions and their ability to say 'No.'"
She says she witnessed efforts by Kavanaugh and Judge to cause girls "to become inebriated and disoriented so they could then be 'gang raped' in a side room or bedroom by a 'train' of numerous boys." Swetnick says in her declaration, "I have a firm recollection of seeing boys lined up outside rooms at many of these parties waiting for their 'turn' with a girl inside the room. These boys included Mark Judge and Brett Kavanaugh."
Swetnick alleges that in 1982, she "became the victim" of one of these rapes "where Mark Judge and Brett Kavanaugh were present." She says she told at least two people what had happened -- and she says she was incapacitated and "unable to fight off the boys raping me." Swetnick believes she was drugged with Quaaludes "or something similar placed in what I was drinking."
She continues, "I likewise observed him be verbally abusive towards girls by making crude sexual comments to them that were designed to demean, humiliate and embarrass them. I often witnessed Brett Kavanaugh speak in a demeaning manner about girls in general as well as specific girls by name. I also witnessed Brett Kavanaugh behave as a 'mean drunk' on many occasions at these parties."
Swetnick says that Kavanaugh's statement on Fox News about his sexual abstinence during high school "is absolutely false and a lie." She claims to have seen him "consistently engage in excessive drinking and inappropriate contact of a sexual nature with women during the early 1980s."
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President Trump responded with a tweet slamming Avenatti.
"Avenatti is a third rate lawyer who is good at making false accusations, like he did on me and like he is now doing on Judge Brett Kavanaugh," the president said. "He is just looking for attention and doesn't want people to look at his past record and relationships - a total low-life!"
There were at least 10 house parties in the Washington, D.C. area that Swetnick says she attended, and Kavanaugh and Judge, whom she says were very close, were both in attendance, too. She says in her statement, "I observed Brett Kavanaugh drink excessively at many of these parties and engage in abusive and physically aggressive behavior toward girls, including pressing girls against him without their consent, 'grinding' against girls and attempting to remove or shift girls' clothing to expose private body parts."
One the chamber's most watched Republicans, retiring Sen. Jeff Flake of Arizona, took to the Senate floor after the latest allegations to offer an apology on behalf of the US Senate to Kavanaugh and Ford, as well as rebuke Trump, and both Republican and Democrat lawmakers, for what he saw as an over politicization of the confirmation process.
"I must also say that separate and apart from this nomination and the facts that pertain to it, I do not believe that a claim of sexual assault is invalid because a 15-year-old girl didn't promptly report the assault to authorities, as the President of the United States said just two days ago," Flake said.
Flake, a member of the Senate Judiciary Committee, also said warned that his fellow panel members may "have to be prepared for the possibility, indeed the likelihood, that there will be no definitive answers to the very large questions before us" following Thursday's hearing.
He also said he and his family have received death threats over his decision to withhold his vote in favor of Kavanaugh until after Thursday's hearing.
Senate Minority Leader Chuck Schumer responded to the latest allegations by calling on Republicans to "immediately suspend the proceedings related" to the nomination and saying that he believes Kavanaugh "should withdraw from consideration."
"Republicans need to immediately suspend the proceedings related to Judge Kavanaugh's nomination, and the president must order the FBI to reopen the background check investigation," the New York Democrat said in a statement.
He added, "I strongly believe Judge Kavanaugh should withdraw from consideration. If he will not, at the very least, the hearing and vote should be postponed while the FBI investigates all of these allegations. If our Republican colleagues proceed without an investigation, it would be a travesty for the honor of the Supreme Court and our country."
This is a developing story and will be updated.
