Immediately after publishing Swetnick's sworn statement on Wednesday alleging Supreme Court Justice nominee Brett Kavanaugh drugged girls as a teenager, Avenatti tweeted a picture of his client, calling her "courageous, fearless and honest".
Swetnick alleged she became one of the victims of "one of these "gang" or "train" rapes".
"I still don't know the location, I still don't know the time, she can't tell me who picked her up, she can't tell me who dropped her off", he said.
The new claims come ahead of Thursday's Senate Judiciary hearing, where an outside female sex crimes prosecutor will question both Kavanaugh and Ford about the accusations.
She reportedly grew up in Montgomery County, Maryland and graduated from Gaithersburg High School in 1980.
A spokesman for the Senate Judiciary Committee said lawyers for the panel were reviewing the declaration submitted by Swetnick, who said she has worked extensively for the federal government including the Treasury Department and Internal Revenue Service. He also revealed the identity of the woman making the allegation: Julie Swetnick.
The bombshell new claims come after two women came forward to accuse the judge of assaulting them in the 1980s, in a scandal that has tripped up what was expected to be an easy confirmation process for the conservative judge. The New York Times reports: "None of Ms. Swetnick's claims could be independently corroborated by The New York Times, and her lawyer, Michael Avenatti, declined to make her available for an interview".
On Tuesday, the Judiciary Committee has scheduled a vote on whether to recommend Kavanaugh to the full Senate for Friday.
Swetnick's allegations come on the heels of claims by two other women that Kavanaugh had engaged in sexual misconduct in high school and later as an undergraduate at Yale University.
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Meanwhile, the White House released a brief statement from Kavanaugh denying the accusations made by Swetnick. Swetnick does not name any of the houses at which these parties allegedly occurred. Kavanaugh denies the incident ever took place. The outlet discovered that an ex-boyfriend of Swetnick filed a restraining order against her in 2001 after she threatened him - threats he said continued even after he got married and had a child.