FBI officials used grand jury subpoenas to obtain emails from associates of Hillary Clinton’s, a bureau official revealed in court documents filed on Wednesday.

The declaration, made by Bill Priestap, the FBI’s assistant director for counterintelligence, reveals grand jury subpoenas were used more expansively than previously known in the bureau’s investigation of Clinton, which centered on whether she mishandled classified information on her private email account.

“In instances where the FBI discovered evidence of the potential unauthorized transmission of classified information from the [Clinton] personal email servers to private third party email accounts of individuals with whom Secretary Clinton corresponded and could establish sufficient probable cause, the FBI sought additional legal process, to include grand jury subpoenas, in order to obtain additional e-mails relevant to the FBI’s investigation,” Priestap wrote in a court declaration.

Politico first reported about the filing, which was made in response to a lawsuit filed by conservative watchdog groups Judicial Watch and Cause of Action Institute.

Investigators’ use of subpoenas in the Clinton email investigation was only revealed in April, in another court declaration made by Priestap.

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In that declaration, Priestap revealed that the FBI obtained grand jury subpoenas in an attempt to retrieve emails from Clinton’s BlackBerry accounts.

Priestap does not say in the declaration which Clinton associates’ email accounts were subpoenaed. As secretary of state, Clinton exchanged classified emails most frequently with a small group of aides, Jake Sullivan, Huma Abedin and Cheryl Mills.

Those aides and others often used private email accounts as well.

Former FBI Director James Comey spoke on several occasions about the Clinton investigation, though he did not disclose that grand jury subpoenas were used as part of the investigation. He announced that charges would not be filed against Clinton during a July 5 press briefing.

FBI Declaration about grand jury subpoenas in Hillary Clinton email case by Chuck Ross on Scribd

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