"I will not be intimidated into withdrawing from this process", Mr Kavanaugh, a conservative federal appeals court judge nominated by Mr Trump in July for a lifetime job on the top U.S. court, wrote in a letter to the Republican-led Senate Judiciary Committee, which is overseeing the confirmation process. Deborah Ramirez described the incident after being contacted by The New Yorker magazine.
In a statement, Grassley said the Judiciary committee's majority staff learned of the allegation made by Ramirez from The New Yorker's report. Chuck Schumer vowed to oppose Kavanaugh with everything he's got, and apparently that took the form of character assassination.
Meanwhile, Senate Majority Leader Mitch McConnell, R-Ky., also accused Democrats of a "shameful, shameful, smear campaign" against Kavanaugh and vowed he will receive an up-or-down vote on his nomination on the Senate floor on "in the near future".
"There's a chance that this could be one of the single-most unfair, unjust things to happen to a candidate for anything", Trump said following a meeting Monday afternoon at the United Nations.
He also questioned the political motivations of the lawyers representing the women, saying "you should look into the lawyers doing the representation".
That reflected a growing sentiment in the West Wing: that delays in the process have allowed more time to produce additional politically motivated decades-old allegations meant to sully Kavanaugh's reputation, the official said.
In the September 22 letter, obtained by CNN, Ford said her decision to first report the alleged assault to her congresswoman, California Democratic Rep. Anna Eshoo, "was a very hard one, but I felt that this was something that a citizen couldn't NOT do".
Professor Christine Blasey Ford claims he pinned her down on a bed during their high school years, covered her mouth with one hand to silence her and tried to pull her clothes off with his other hand while drunk.
Speaking in New York, Trump labeled the charges "totally political".
The second claim against Kavanaugh dates to the 1983-84 academic year, which was his first at Yale University.
Ramirez was reluctant at first to speak publicly "partly because her memories contained gaps because she had been drinking at the time of the alleged incident", The New Yorker reported.
Ford also wrote that she has hired security and has spent a "considerable time managing death threats".
A White House official said President Donald Trump stands 100% behind Kavanaugh.
The committee's top Democrat, senator Dianne Feinstein, has called on Senator Grassley to postpone Thursday's hearing in order to investigate Ms Ramirez's accusations. A breakthrough came over the weekend as Ford agreed to testify.
Senate Democrats are now investigating a bombshell claim by Ms Deborah Ramirez, 53, who says Mr Kavanaugh exposed himself to her during a 1980s college party at Yale University, thrust his genitals in her face and caused her to touch them without her consent, according to The New Yorker.
The similar tones and wording they used in defending him suggested a concerted effort to undermine the women's claims and portray an image of unity among GOP senators while pressing toward a confirmation vote.
Stormy Daniels' attorney Michael Avenatti says he has a third woman who is going to come forward and make public complaints about Kavanaugh and his Georgeown Prep high school roommate Mark Judge. "We can say with confidence that if the incident Debbie alleges ever occurred, we would have seen or heard about it-and we did not", the friends and classmates wrote in a statement to The New Yorker.