Attorney Michael Avenatti on Thursday blasted the FBI's supplemental background investigation into sexual misconduct allegations against Supreme Court nominee Brett Kavanaugh as the FBI delivered its findings to the White House and the Senate.

Avenatti, who represents Julie Swetnick — who has said in a sworn affidavit that Kavanaugh attended a party where she was drugged and attacked by a series of men in a "gang rape" — accused the FBI of refusing to contact at least six witnesses connected to various sexual misconduct claims made against Kavanaugh over the course of the weeklong investigation.

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Democrats have raised a number of concerns over limits in the scope of the FBI's investigation that was opened after GOP Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (Ariz.) called for it ahead of Kavanaugh's confirmation vote in the full Senate.

"The FBI investigation was no investigation at all," Avenatti tweeted Thursday after the report was delivered to the Senate.

"@realDonaldTrump, @senatemajldr and @ChuckGrassley ensured that numerous key witnesses, including six very damaging witnesses I am aware of, were never even interviewed. Their conduct is a disgrace - they never wanted the truth," he added, referring to 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.) and Senate Judiciary Committee Chairman Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyCollins says she will vote 'no' on Supreme Court nominee before election The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Gardner signals support for taking up Supreme Court nominee this year MORE (R-Iowa).

The FBI investigation was no investigation at all. @realDonaldTrump, @senatemajldr and @ChuckGrassley ensured that numerous key witnesses, including six very damaging witnesses I am aware of, were never even interviewed. Their conduct is a disgrace - they never wanted the truth. — Michael Avenatti (@MichaelAvenatti) October 4, 2018

"You should be embarrassed to call yourself the chairman of the judiciary committee," he added in a tweet to Grassley. "Your irresponsibility & partisan conduct in controlling the scope of a bogus investigation will likely forever damage the image of the committee and the SCOTUS in the eyes of the world."

You should be embarrassed to call yourself the chairman of the judiciary committee. Your irresponsibility & partisan conduct in controlling the scope of a bogus investigation will likely forever damage the image of the committee and the SCOTUS in the eyes of the world. #Disgrace — Michael Avenatti (@MichaelAvenatti) October 4, 2018

Avenatti, who also represents adult-film star Stormy Daniels in her ongoing defamation case against President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, was met with mockery from Republicans upon his announcement of representation for Swetnick, one of three women who has accused Kavanaugh of sexual misconduct.

Kavanaugh has fiercely denied the allegations, specifically calling Swetnick's claims a "joke" during his sworn testimony before the Judiciary panel last week.

Avenatti has said in recent weeks that he is considering a 2020 presidential run as a Democrat, and recently released a set of campaign positions ahead of a possible bid for the nomination.