The FBI was not allowed to do the investigation they are capable of doing.
“The bureau agreed not to interview Kavanaugh or Christine Blasey Ford, who accused him of sexually assaulting her, or to respond to many people stepping forward with new information. They agreed not to follow up on possible lies Kavanaugh is accused of telling in his Senate testimony. And they made other concessions unknown to the public or even Democrats on the Senate Judiciary Committee.
According to the New York Times’s reporting, White House lawyer Don McGahn made sure relevant questions went deliberately unexplored because, he believed, “a wide-ranging inquiry like some Democrats were demanding — and Mr. Trump was suggesting — would be potentially disastrous for Judge Kavanaugh’s chances of confirmation to the Supreme Court.”
https://www.vox.com/policy-and-polit...-investigation