One of Justice Brett M. Kavanaugh’s accusers admitted this week that she made up her lurid tale of a backseat car rape, saying it “was a tactic” to try to derail the judge’s confirmation to the Supreme Court.

Sen. Charles E. Grassley, chairman of the Judiciary Committee revealed the fraud in a letter to the FBI and Justice Department Friday, asking them to prosecute Judy Munro-Leighton for lying to and obstructing Congress.

Mr. Grassley said Ms. Munro-Leighton is a left-wing activist who hijacked another “Jane Doe” anonymous report about a backseat rape and claimed it as her own story, calling it a “vicious assault.”

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“I am Jane Doe from Oceanside CA — Kavanaugh raped me,” Ms. Munro-Leighton wrote in an Oct. 3 email claiming to have been a victim of the judge.

Mr. Grassley’s investigators tried to reach her for a month but were unsuccessful until this week, when they spoke to her by phone and she confessed that she was not the original Jane Doe, and “did that as a way to grab attention.”

She admitted to the false allegation, and said she has actually never met Justice Kavanaugh.

“I was angry, and I sent it out,” she told investigators.

“In short, during the committee’s time-sensitive investigation of allegations against Judge Kavanaugh, Ms. Munro-Leighton submitted a fabricated allegation, which diverted committee resources,” Mr. Grassley wrote. “When questioned by Committee investigators she admitted it was false, a ‘ploy,’ and a ‘tactic.’ She was opposed to Judge Kavanaugh’s confirmation.”

President Trump seized on the report Saturday, calling her “a vicious accuser.”

“What about the others? Where are the Dems on this?” he demanded via Twitter.

Mr. Grassley has previously asked the FBI to probe Julie Swetnick and her lawyer, anti-Trump crusader Michael Avenatti, for lying to Congress and obstructing. Ms. Swetnick had originally claimed to have been the victim of gang rapes involving Justice Kavanaugh during high school parties, saying she saw him and a friend spike punch to leave girls unable to resist. She later changed her story to say she saw Justice Kavanaugh and his friend near a punch bowl, and could not identify them as having actually been part of any rape.

None of the witnesses she told NBC could corroborate her story were able to do so.

Indeed, NBC found one woman who despite a sworn statement backing up Ms. Swetnick, told the network Mr. Avenatti was twisting her words.

Justice Kavanaugh’s confirmation process was delayed while the committee investigated a number of sexual assault and harassment claims, none of which have been corroborated by any public evidence to date.

He vehemently denied all of the claims.

He was confirmed, though only one Democrat joined with all but one Republican in backing him.