DOJ “Grand Conspiracy” Probe Intensifies as Former CIA Director John Brennan Is Subpoenaed

WASHINGTON — September 21, 2026

 

 

 

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The Justice Department’s sprawling “grand conspiracy” investigation has intensified, with former CIA Director John Brennan subpoenaed to testify before a federal grand jury in Fort Pierce, Florida, on October 15.

The inquiry examines whether former intelligence and law-enforcement officials conspired to violate Donald Trump’s rights through investigations stretching from Russia’s 2016 election interference to later federal cases involving the president.

Although Trump and allies have repeatedly described the matter as a conspiracy rooted in the Obama era, publicly reported evidence has not established that Barack Obama personally committed a crime.

Brennan, who led the CIA under Obama, is now considered a subject of the broader conspiracy investigation, according to his attorney, who disclosed details of recent conversations with federal prosecutors.

His lawyers also say Brennan remains a target in a separate investigation into whether he made false statements to Congress about the intelligence community’s assessment of Russian interference in the 2016 election.

Brennan has denied wrongdoing and argues that the investigations are politically motivated. His legal team is seeking a court order requiring the Justice Department to preserve records connected to the probes.

The Justice Department has opposed that preservation request, arguing that Brennan has not been charged and that his concerns about future prosecution remain speculative at this stage of the investigation.

The newest subpoena arrived as prosecutors increased pressure on former officials, shifting from voluntary interviews toward compelled grand-jury testimony in a case that has been developing for roughly a year.

The investigation is centered in Florida and has examined conduct by officials from both Obama- and Biden-era administrations, including actions related to intelligence assessments, Russia inquiries, and the Mar-a-Lago documents investigation.

One major focus is the January 2017 intelligence assessment concluding that Russia interfered in the 2016 election and that President Vladimir Putin ordered an influence campaign aimed at affecting the presidential race.

A later CIA review identified procedural concerns surrounding the preparation of that assessment but did not overturn the central conclusion that Russia interfered in the election, according to Associated Press reporting.

Special counsel Robert Mueller later documented extensive Russian interference but said his investigation did not establish that the Trump campaign conspired or coordinated with the Russian government in its election-interference activities.

Those findings remain important context because the current Justice Department investigation is examining a different theory: whether government officials improperly targeted Trump and violated his constitutional or civil rights.

The inquiry has also faced internal turbulence. Joe diGenova, the prosecutor appointed to supervise the broad investigation, resigned in September after disagreements with senior Justice Department officials over the probe’s management.

DiGenova’s departure did not end the investigation. Brennan’s subpoena was issued the same day, and other prosecutors have continued pursuing grand-jury activity and additional lines of inquiry in Florida.

Earlier reporting indicated investigators had summoned or sought information from multiple former intelligence officials, including figures connected to the Obama administration who played roles in examining Russian interference and Trump-related intelligence.

The investigation has drawn sharp disagreement. Trump and his allies say past investigations were politically weaponized, while Brennan’s lawyers and other critics describe the current inquiry as retaliatory and legally questionable.

At this point, those competing claims remain allegations rather than judicial findings. A grand-jury subpoena can compel testimony or evidence, but it does not by itself establish criminal wrongdoing or guilt.

No publicly announced charge against Obama has emerged from the broader conspiracy investigation, and current reporting focuses primarily on former officials such as Brennan and on the conduct of federal agencies.

The next major public milestone could come when Brennan is scheduled to appear before the Florida grand jury, though grand-jury proceedings are secret and prosecutors have not announced whether charges will follow.