Former CIA Director John Brennan is subpoenaed to testify before a Florida grand jury as part of a Justice Department investigation sometimes described as a “grand conspiracy” involving President Donald Trump. Brennan’s lawyer says prosecutors presented the subpoena in recent days and that Brennan is expected to appear next month, with the hearing scheduled for October 15 in Fort Pierce, Florida.

The inquiry concerns whether law enforcement and intelligence officials conspired against Trump. Different outlets describe the investigation in slightly different terms, including a focus on possible efforts to deprive Trump of civil rights, but all reporting ties the subpoena to a DOJ probe conducted through a grand jury process.

The reports do not specify the underlying evidence or targets beyond the broad scope of potential coordination between former intelligence and law enforcement figures. They also do not indicate whether Brennan’s testimony is sought to support specific charges or to gather information for a potential future case.