Separately, Michael Avenatti, the lawyer best known for representing adult film star Stephanie Clifford, who says she had an affair with Donald Trump before he was elected president, said on Twitter that he represents a woman "with credible information regarding Judge Kavanaugh". "It was kind of a joke", she recalled.
Ford's attorneys say that several requests they have made of the committee have been refused, such as calling additional witnesses who Ford remembers being at the party, and having the FBI investigate her story.
The accusation from Ramirez raises the stakes further for a dramatic showdown Thursday, as Kavanaugh and Ford testify in public about an incident she characterizes as attempted rape - and that he says simply never happened.
Kavanaugh's nomination was already in a perilous state ahead of a hearing planned for Thursday on an allegation by California professor Christine Blasey Ford that he sexually assaulted her at a high school party three decades ago. Then, like now, another Republican president had selected a Supreme Court nominee, now-Justice Clarence Thomas, facing accusations of sexual harassment.
Mr Grassley's stance reflected a desire by Mr Trump and Republican leaders to usher Mr Kavanaugh on to the high court by the October 1 start of its new session and before the November elections. She admitted to being intoxicated during the alleged incident, and was at first tired of coming forward because of gaps in her memory. Though she told the New Yorker she was not "politically motivated" to share her story, the RNC presented other details that, they think, call this into question.
Senator Orrin Hatch, a Republican member of the committee, blamed Democrats for the new allegation.
The New Yorker published a story on Sunday night in which Deborah Ramirez, a college classmate of Brett Kavanaugh's, claims that Kavanaugh exposed himself during a party during their freshman year at Yale.
Ford's lawyers said it was still unclear as of Sunday who will ask questions, as Republicans were trying to hire an outside female counsel for the role.
Celebs are getting on board with the protest, including Amy Schumer, who wrote, "I believe Dr. Christine Blasey Ford and will be taking part in a national moment of solidarity". The 11 senators on the GOP side of the dais are all men, which could send an unwanted message on live television against the backdrop of the #MeToo era.
Sen. Lindsey Graham, R-S.C., who sits on the judiciary committee, said in a Fox News Sunday interview that Ford's testimony was unlikely to change his mind, the Post reports. "At a minimum, we need a hearing and investigations on all of the charges against him", said protester Sarah Newman, a 44-year-old Washington resident. She said, point-blank, I don't want to ruin anyone's life, but she feels this is a serious claim.
On Friday, Mr Grassley had rejected concessions Ms Ford wanted if she is tell her story publicly before the committee.
Durbin told ABC's "This Week" that some Republicans "reached out to Democratic senators and assured them that they are looking to this as kind of a determination as to how their final vote" on Kavanaugh is cast.
Ramirez said that what has stayed with her most forcefully is the memory of laughter at her expense from Kavanaugh and the other students.
The magazine says Ramirez remembers that Kavanaugh exposed himself at a drunken dormitory party, thrust his penis in her face, and caused her to touch it without her consent as she pushed him away.
Trump mused to confidants that the "fake" attacks against his nominee were meant to undermine his presidency, according to a White House official and a Republican close to the White House.