As the Kavanaugh controversy roils on, the accusers and defenders have piled up, with a growing number of names thrown into the mix. Here are the critical few and how they might relate to the FBI investigation:

Brett Kavanaugh

Supreme Court nominee Brett Kavanaugh has so far denied a multiple allegations of sexual assault and misconduct.

During his testimony before the Senate Judiciary Committee last week, Kavanaugh disputed accounts of his drinking and behavior in high school and college, and declined to call for an FBI investigation, although he said he would cooperate with any route the Senate pursued.

Christine Blasey Ford

A California professor, Ford is the first woman to come forward with accusations against Kavanaugh. She alleges that he sexually assaulted her at a party in their high school years.

Ford, who testified before the committee Friday, has called for an FBI review of her allegations since she came forward. She had not heard from the FBI as of Monday morning, according to a person on Ford's team.

Deborah Ramirez

In a New Yorker report last month, Ramirez alleged that Kavanaugh exposed himself to her while he was a freshman at Yale. Kavanaugh has denied this allegation as well.

A source told CNN that the FBI spoke with Ramirez on Sunday and that she had supplied the FBI with the names of witnesses.

Mark Judge

Judge is a friend of Kavanaugh's from his high school years. Both Ford and Julie Swetnick, another accuser, say that Judge was present at the women's alleged assaults.

Judge said he had no memory of the incident Ford described, and "vehemently denies" Swetnick's allegations. Judge has been interviewed by the FBI, his lawyer said Monday.

Patrick J. Smyth

Ford said Patrick J. Smyth, also referred to as PJ. Smyth, was also present at the party where she was allegedly assaulted.

In a letter via his attorney to the committee, Smyth denied having any "knowledge of the party in question" or "any knowledge of the allegations of improper conduct she has leveled against Brett Kavanaugh."

Smyth has been interviewed by the FBI, his lawyer said Monday.

Leland Keyser

As with Smyth, Ford said Leland Keyser was at the party. Keyser said in a letter from her lawyer that she did not refute Ford, but did not remember the incident.

The letter said Keyser would "cooperate fully" with an FBI investigation. Two sources told CNN that the FBI has interviewed Keyser.

Chad Ludington

Chad Ludington is a former classmate of Kavanaugh from Yale, who stated that Kavanaugh "has not told the truth" in regard to his drinking.

Ludington said he was going to take his information to the FBI. A source told CNN previously that Kavanaugh's drinking history was not part of its investigation.

Elizabeth Rasor

Rasor told the New Yorker that she dated Judge for about three years, and claims that Judge told her of an incident where he and others took turns having sex with a drunk woman, although she did not say Kavanaugh participated. An attorney for Judge told The New Yorker that Judge "categorically denies" Rasor's account.

Rasor said in a letter to the Committee that she would be willing to speak with the FBI.

Julie Swetnick

Julie Swetnick became the third public accuser against Kavanaugh, accusing him of participating in gang rapes and being present at a party where she herself was the victim of a gang rape. Kavanaugh has denied her allegations.

It is not clear if the FBI intends to interview her.

Read more on the key figures here.