FBI agents raided the Orange County home of Special Agent Johnathan Buma on Monday.
Buma told Congress that the bureau forced him to stop investigating Rudy Giuliani.
Documents show Buma is suspected of mishandling classified information, which his attorney denies.
A squad of federal agents in tactical gear executed a search warrant on Monday at the home of one of their own, FBI special agent Johnathan Buma, according to Buma's attorney, Scott Horton.
A search warrant reviewed by Business Insider states that Buma is suspected of violating laws against mishandling classified information, and a property receipt lists "classified material" and "possible classified material" as being among the items seized.
Horton said that both the allegations and the property receipts were false.
"There was no classified information found by the raid," he said. "I know that from talking to my client."
The FBI declined to comment.
In July, Buma filed protected whistleblower disclosures alleging bureau mismanagement and retaliation. His 22-page disclosure to the Senate Judiciary Committee alleges that Buma was ordered not to investigate Donald Trump's associates and that he was forced to shut down his most valuable confidential sources. It also describes evidence collected by Buma indicating that Rudy Giuliani, Trump's personal attorney, was compromised by a Russian intelligence asset.
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