Harvard Law School professor emeritus and civil liberties authority Alan Dershowitz on Monday cast doubt on new sexual assault allegations leveled at Supreme Court nominee Brett Kavanaugh.

Deborah Ramirez, a Yale University classmate of Kavanaugh’s, came forward late Sunday in an explosive New Yorker article claiming that he placed his penis in her face during a drunken dorm-room party during their freshman year.

Ramirez (pictured above left) acknowledged that she had been drinking heavily and that she could not be certain of her memories.

In addition, multiple people she said were present have denied being there or have said they have no memory of the incident.

But the article also stated that she told her parents, and it quotes some Yale alumni saying they remember hearing about the incident at the time — including that Kavanaugh was involved.

“Now the question is whether this other woman who was a college freshman classmate of Kavanaugh will be heard,” Dershowitz said. “Her evidence seems very sketchy, particularly the fact it took her six days to put it together, and she still doesn’t remember for sure how she concluded it was Kavanaugh (pictured above right). She has a vague recollection of Kavanaugh pulling his pants up.”

Dershowitz was an active professor at Harvard for 50 years. He’s now an emeritus professor there.

Despite being “extremely circumstantial” and based on hearsay, Dershowitz said Ramirez’s allegations should be investigated. He said the FBI should update the background check it conducted on Kavanaugh after President Donald Trump tapped him in July to replace retiring Supreme Court Justice Anthony Kennedy.

“Of course, Avenatti is coming in, which damages the credibility of anyone he touches, because here’s a man who’s running for president.”

Dershowitz discounted a third allegation, made on Twitter Sunday night by lawyer Michael Avenatti, who claimed to represent a woman who had been gang-raped by Kavanaugh and his friends in high school.

Avenatti, who gained notoriety for representing porn star Stormy Daniels in a lawsuit against Trump, has publicly toyed with running for president.

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He accused Kavanaugh friend Mark Judge by name of participating in the alleged gang-rape, which could open the controversial lawyer to liability himself because Judge is almost certainly not a public figure.

“Of course, Avenatti is coming in, which damages the credibility of anyone he touches, because here’s a man who’s running for president. Oh, my God … But he’s muddied up the waters as well,” Dershowitz said.

Dershowitz said reasonable senators can disagree as to how much weight to give conduct by a nominee when he was a teenager — if the conduct even is established.

Dershowitz added that however they come out on that question, though, the standard should be consistent and not shift based on the nominee. He said the Senate probably even should establish standing rules in advance governing how to handle late-breaking allegations against a nominee.

“We have to have one rule for Democrats and the same rule for Republicans,” he said. “The shoe-on-the-other-foot test has to be applied.”

Standing rules — before senators know who the nominee is — would mean “they can’t just make it up as they go along,” Dershowitz said.

Dershowitz said he knew Kavanaugh in passing when they served on the faculty together at Harvard Law School. The dean at the time — now-Justice Elena Kagan — had offered the teaching post to Kavanaugh in an effort to promote ideological diversity.

Related: Kellyanne Conway on Second Kavanaugh Accuser: Feels Like a ‘Vast Left-Wing Conspiracy’

“Everybody respected him,” Dershowitz said. “He was a fantastic professor. There were no allegations, obviously, of any improprieties when he was at Harvard. And everybody thought the world of him there.”

Dershowitz said that if Democrats defeat Kavanaugh, it might be a “Pyrrhic victory” since Trump might be able to get an even more conservative justice confirmed. The confirmation process is a “mess,” he added.

“I suspect we’re going to hear that from Chief Justice [John Roberts] when he delivers his State of the Judiciary message,” Dershowitz said. “It would be perfectly appropriate … I think he should be talking about what’s happening to the process, and how the process affects the judicial system. It’s going to keep good people away.”