Sen. Chris Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Dele.) said Thursday he won't pre-judge the findings of an FBI investigation into sexual misconduct allegations against Supreme Court nominee Brett Kavanaugh, but expressed concerns about how thorough the review was.

"Over the last couple of days, there’s been a fair amount of back and forth about what we asked for, what was promised and now today we’ll see what’s delivered," Coons said on CNN's "New Day."

Coons, a member of the Senate Judiciary Committee who helped establish the supplementary FBI investigation, said he's bothered that the bureau did not speak with Christine Blasey Ford, who testified last week that Kavanaugh pinned her to a bed and groped her at a high school party in the 1980s.

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Several former Yale classmates of Kavanaugh have also said they unsuccessfully reached out to the FBI about sharing information. Deborah Ramirez has alleged Kavanaugh exposed himself to her at a party at Yale in the 1980s.

"I’m concerned that if they never interviewed Dr. Christine Blasey Ford or her corroborating witnesses, if they never interviewed many of Judge Kavanaugh's classmates from Yale who came forward to be heard about the alleged incident with Debbie Ramirez, that this isn’t the investigation I was hoping for," Coons said. "But I won’t pre-judge it. I haven’t sent the report yet."

Coons said he would have liked the FBI to have taken a week to follow "all investigatory leads on the credible allegations" against Kavanaugh.

In addition to Ford and Ramirez, Julie Swetnick alleged in a signed declaration that Kavanaugh was part of a group of high schoolers in the 1980s that she witnessed trying to intoxicate women so they could be "gang raped."

Kavanaugh has fiercely denied all of the allegations against him.

Senators on Thursday will get the chance to review the FBI's findings. The White House said Thursday that agents reached out to 10 people for the investigation, and were able to speak with nine of them.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) has set a key process vote on Kavanaugh's nomination for Friday, meaning senators are likely to vote on the judge's confirmation by this weekend.