Sen. Tim Kaine Timothy (Tim) Michael KaineButtigieg stands in as Pence for Harris's debate practice Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (D-Va.) became the latest Senate Democrat on Thursday to criticize the FBI's investigation into sexual assault allegations against Supreme Court nominee Brett Kavanaugh, calling the investigation a "complete sham."

"This so-called 'investigation' is a complete sham," Kaine wrote in a tweet.

Kaine argued that the FBI should have investigated for a longer period and called it an "insult to Americans" that the bureau's report isn't being made public.

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Only one copy of the report is being made available for senators to review, he noted, with lawmakers reading it in the secure compartmented information facility in the Capitol Visitor Center.

"Why not do a real investigation? Why limit Senate access to the report? Why limit public access to it? There can only be one of two answers: the Republican majority doesn’t care about allegations of sexual assault, or they’re worried of what a true investigation would uncover," Kaine wrote in subsequent tweets.