Washington (CNN) Democratic Sen. Chris Coons said Tuesday that the FBI's investigation into sexual misconduct allegations during confirmation hearings for Supreme Court Justice Brett Kavanaugh was a "sham."

During an interview with CNN's Alisyn Camerota on "New Day," the Delaware senator also said he's interested in figuring out who handled the probe and that a new investigation should be opened into the allegations by two women who came forward last year.

"The question that we don't have answered, Alisyn, is given that that investigation is a sham, at whose direction did that happen? The FBI doesn't just make these things up. They were acting in response to a client, whether they considered that White House counsel or the Senate Judiciary Committee majority," Coons said.

Coons' comments come in the wake of new developments in the Kavanaugh saga, which began a year ago after allegations of sexual misconduct surfaced against the nominee during the confirmation process. Following an outcry from congressional Democrats, including Coons, who sits on the Senate Judiciary Committee, the FBI opened a supplemental background investigation into Kavanaugh, which ultimately found none of the allegations to be true. Kavanaugh has vehemently denied all of the allegations against him.

Sen. Chuck Grassley, who chaired the Judiciary Committee during Kavanaugh's confirmation, defended the committee's review of allegations against Kavanaugh, calling it "incredibly thorough" and saying "in the end there was no credible evidence to support any of the allegations."

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