The Pete Hegseth defense leak probe has intensified after dozens of senior U.S. military and civilian officials underwent polygraph examinations tied to disclosures about sensitive weapons stockpiles. The investigation centers on how classified information about U.S. munitions reached the media during the conflict with Iran.
The testing represents an unusually broad effort by the Pentagon to identify the source of sensitive disclosures. About 50 members of the Joint Staff reportedly underwent examinations in August, while other senior officials connected to U.S. Central Command and combatant commands also faced testing.
The investigation has not publicly identified a leaker. Officials familiar with the examinations also said that nobody failed the questions designed to determine whether they had leaked information to journalists.
The Pentagon has maintained that it does not discuss internal personnel or investigative matters. It has, however, stressed that protecting classified national security information remains a priority.
Why the Pentagon launched the leak investigation
The investigation followed media reports about the condition of U.S. weapons inventories during the Iran conflict.
Several news organizations reported on the rapid use of sophisticated American munitions, including weapons needed for sustained military operations. The disclosures raised questions about how quickly certain stockpiles were being depleted.
The information attracted particular attention because weapons inventories can reveal sensitive details about U.S. military readiness.
The Pentagon therefore began examining whether officials with access to classified information had provided protected details to journalists.
Investigators focused on personnel who could have had access to information about munitions supplies and operational planning.
The inquiry became much broader than a conventional investigation into a single disclosure. About 50 Joint Staff personnel reportedly underwent polygraph testing, while other senior officials also faced examinations.
The scale of the effort has made the investigation a major internal Pentagon security matter.
Dozens of senior officials faced polygraph tests
The most significant revelation concerns the number and seniority of the people tested.
The New York Times reported that investigators subjected roughly 50 members of the Joint Staff to polygraph examinations. The group included both military officers and civilian employees.
CBS News separately reported that several dozen officials received polygraph tests, including some officials connected to U.S. Central Command and other combatant commands.
The Joint Staff normally includes roughly 1,500 to 2,000 officers and officials. Its role involves coordinating military operations, policy and war planning with combatant commands.
The investigation therefore reached into an important part of the Pentagon’s military planning structure.
Not every senior military leader underwent testing.
Gen. Dan Caine, chairman of the Joint Chiefs of Staff, was not among those subjected to the polygraphs, according to a senior Pentagon official.
That distinction is important because reports describing the investigation as involving every senior military leader would go beyond the confirmed information.
What investigators wanted to know
The questions reportedly focused on whether officials had disclosed classified information to members of the media.
Investigators also asked about information concerning reduced U.S. munitions stocks.
The examinations took place in August, following a series of reports about weapons shortages during the Iran conflict.
The investigation was not limited to determining whether someone spoke with a journalist.
Officials said the polygraphs covered various national security issues. The central concern remained whether protected information had reached the press without authorization.
CBS News reported that no one failed the questions intended to determine whether officials had leaked information to the media.
That result has not produced a publicly identified source.
The Pentagon also has not announced disciplinary action against a named official in connection with the current weapons-stockpile investigation.
Why weapons stockpile information is sensitive
Weapons inventory information can reveal important details about military capabilities.
If an adversary knows how many advanced weapons remain available, it can gain insight into the United States’ ability to maintain a campaign.
Information about shortages can also reveal pressure on production lines, deployment schedules and military planning.
That makes reports about munitions availability especially sensitive during an active conflict.
The recent investigation emerged after media reports described the pace at which the United States was using advanced weapons during the Iran war.
The Pentagon’s concern was therefore not simply about unfavorable publicity.
Investigators wanted to determine whether classified information had been improperly disclosed.
Hegseth has made leak investigations a priority
The current investigation fits into a broader effort by Defense Secretary Pete Hegseth to address unauthorized disclosures.
In July, Hegseth announced that the Pentagon and Justice Department had created a joint task force focused on identifying and prosecuting people suspected of leaking sensitive government information to the press.
The move significantly expanded an effort that had already begun within Hegseth’s office.
Hegseth also gave the Pentagon’s Office of General Counsel broad authority to request information, records and assistance from offices throughout the Defense Department during leak investigations. Pentagon personnel were instructed to prioritize those requests and respond within two days.
Hegseth said at the time that leaked information could put lives at risk.
The July initiative established a formal framework for cooperation between the Pentagon and Justice Department.
The latest polygraph examinations show how that policy has been applied to an investigation involving senior military personnel.
The FBI was not involved in the polygraph testing
The current investigation should not be described as an FBI-led operation.
Several people with direct knowledge of the matter told CBS News that the FBI did not participate in the polygraph examinations. The military has its own investigators who can conduct counterintelligence and security investigations.
Defense secretaries can direct counterintelligence investigations involving polygraph examinations.
Those examinations also operate under federal law and Pentagon regulations.
The rules include procedural safeguards surrounding the use of polygraphs.
The current reporting does not establish that the FBI has identified or charged a suspect in connection with the weapons-stockpile disclosures.
The Pentagon has kept most investigative details private.
The investigation remains unresolved
The biggest unanswered question is who provided the sensitive information to the media.
No public announcement has identified a specific military officer, civilian employee or other Pentagon official as the source.
The reported polygraph results have not produced a publicly confirmed culprit.
That leaves the investigation open.
The Pentagon has not announced a final finding connecting a named individual to the disclosures.
It has also not publicly disclosed all of the classified information that investigators are examining.
As a result, claims about a specific leaker would go beyond the confirmed record.
The known facts show a broad internal investigation, extensive polygraph testing and continued efforts to determine how sensitive weapons information reached journalists.
Congress says it has not received a briefing
The investigation has also attracted attention on Capitol Hill.
Rep. Jason Crow, a Colorado Democrat who serves on both the House Armed Services Committee and House Intelligence Committee, said Sept. 6 that Congress had not received information about the investigation.
Crow said lawmakers learned about the investigation through public reports rather than a congressional briefing.
He said protecting classified information is important but criticized the broader environment surrounding Hegseth’s handling of Pentagon information.
Crow’s comments represent his assessment of the situation. They do not establish a congressional finding that the investigation violated federal law.
Still, the absence of a congressional briefing has become an important part of the latest controversy.
The issue could receive additional attention if lawmakers seek more information about the scope of the testing and the status of the investigation.
The polygraph effort is unusually broad
Polygraph examinations are not new within the U.S. national security system.
Military and civilian personnel who work with highly classified information can encounter polygraph requirements as part of security and counterintelligence procedures.
However, the number of people involved in the current investigation has drawn attention.
The New York Times reported that mass polygraph testing at this level has no modern precedent among the top ranks of the U.S. military.
CBS News also reported that officials described the volume of testing as extremely unusual.
That makes the current investigation different from an examination involving one employee or a small group of officials.
The Pentagon has not publicly released a complete list of everyone who underwent testing.
Pentagon rules place limits on polygraph use
Pentagon rules govern how officials can use polygraph examinations.
The examinations generally require consent, and specific procedures apply when investigators use testing to investigate possible unauthorized disclosures.
TIME reported that issue-specific counterintelligence examinations require investigators to have interviewed the individual, have a reasonable basis for believing the person knows about or was involved in the matter, and pursue other investigative avenues as circumstances allow.
The rules also require the Defense Department to oversee the responsible and effective use of polygraphs.
Congressional defense committees are entitled to information concerning their use.
The Pentagon has not released enough information publicly to determine whether every procedural step was followed in the current investigation. It has also not released its investigative findings.
That limits what can be concluded about the examinations beyond the facts already reported.
The investigation follows earlier Hegseth leak disputes
Hegseth has faced other leak-related controversies since becoming defense secretary.
One earlier episode involved a planned classified Pentagon briefing concerning China and Elon Musk.
Reports at the time said Hegseth was angry that information about the planned briefing had reached the media.
The episode contributed to broader tensions between Hegseth and senior Pentagon officials over unauthorized disclosures.
The current investigation differs because it centers on weapons-stockpile information connected to the Iran conflict.
The latest effort also involves a much larger group of officials.
That distinction matters when assessing the present investigation.
The Pentagon has also tightened information access
The leak investigation comes as the Pentagon has taken additional steps to restrict access to sensitive information.
In early September, the department removed decades of documents associated with the Secretary of Defense Orders Book from an internal classified system, according to reporting based on people familiar with the change.
The documents contain information concerning military resources, including the location and availability of forces and weapons systems.
The move followed reporting about internal military concerns related to the Iran conflict.
The Pentagon did not publicly discuss the specific change in access.
These measures form part of a wider effort to protect sensitive operational information.
They also demonstrate why information security has become a central issue inside the department during the conflict.
What the current facts establish
The available information supports several clear conclusions.
First, the Pentagon conducted a broad polygraph effort involving senior military and civilian personnel.
Second, investigators focused on possible unauthorized disclosures involving sensitive weapons-stockpile information.
Third, approximately 50 Joint Staff personnel were reportedly tested, while other officials from combatant commands also underwent examinations.
Fourth, no one reportedly failed the questions specifically intended to determine whether they had leaked information to the media.
Fifth, Gen. Dan Caine was not among those tested.
Sixth, the FBI did not conduct the polygraph examinations.
Finally, no publicly identified individual has been established as the source of the disclosures.
Those facts define the current status of the investigation without adding unverified claims.
What comes next
The Pentagon’s investigation remains active from the public’s perspective.
Investigators still need to determine whether classified information was improperly disclosed and, if so, identify the person responsible.
The department may also review how many officials had access to the information involved in the media reports.
Congress could seek additional information about the investigation, particularly after lawmakers said they had not received a briefing.
For now, the Pentagon has not announced a final resolution.
The reported polygraph results also have not publicly identified a leaker.
That leaves the central question unanswered: how did sensitive information about U.S. weapons stockpiles reach the media?
The answer will depend on future verified findings from the Pentagon or other authorized investigators.
The Pentagon’s sweeping investigation remains unresolved, and the next confirmed development could determine whether the leak hunt produces a specific source or remains an internal security inquiry.