Former CIA Director John Brennan is set to testify before a grand jury. He has been subpoenaed in the Justice Department's conspiracy investigation. The testimony is scheduled to take place next month.

The grand jury is located in Florida. Further details about the investigation and Brennan's involvement are available from the source.

The Justice Department's investigation is focused on a conspiracy matter, though specific details are not provided here. For more information, readers can consult the original report.