Former CIA Director John Brennan has been subpoenaed to testify before a Florida grand jury next month as part of a Justice Department investigation into whether former law enforcement and intelligence officials conspired against President Donald Trump.

Brennan’s attorney, Ken Wainstein, disclosed in a court filing that prosecutors presented Brennan with a subpoena last Thursday ordering him to appear Oct. 15 before a grand jury in Fort Pierce, Florida. Prosecutors told Wainstein the subpoena is connected to a broad criminal investigation examining whether officials involved in investigations of Trump over the past decade coordinated efforts that violated his civil rights.

The investigation has examined the government’s response to Russian interference in the 2016 election, as well as the FBI’s 2022 search of Trump’s Mar-a-Lago estate for classified documents. The probe has issued subpoenas to multiple former government officials in recent weeks as prosecutors seek sworn testimony.

Brennan also remains a target in a separate Washington-based investigation into whether he made false statements to Congress in 2023. Brennan and his attorneys have denied the allegations. Earlier subpoenas in that investigation were withdrawn in favor of voluntary interviews.

The latest subpoena came the same day Joe DiGenova, who had been overseeing the broader investigation, resigned. The Justice Department has not publicly announced a replacement. Kurt Olsen, another member of the investigative team, informed Wainstein about Brennan’s status in the investigation.

Brennan disclosed the subpoena ahead of a court hearing in his lawsuit seeking preservation of records related to the investigations. His attorneys argue that those records could be important if prosecutors eventually seek an indictment and Brennan challenges it as vindictive prosecution.

The broader investigation has not resulted in criminal charges. Previous reviews of the Trump-Russia investigation identified errors and omissions but did not establish a criminal conspiracy among senior law enforcement officials.