Microsoft and retired military chiefs back AI company Anthropic in court fight against Pentagon

Microsoft and a group of retired military leaders are throwing their weight behind Anthropic in asking a federal court to block the Trump administration's designation of the artificial intelligence company as a supply chain risk.

Microsoft, in a legal filing, is challenging Defense Secretary Pete Hegseth's action last week to shut Anthropic out of military work by labeling its AI products as posing a threat to national security.

So are a group of 22 former high-ranking U.S. military officials, some of whom were secretaries of the Air Force, Army and Navy and a head of the Coast Guard. They allege in their own court filing that Hegseth's actions are a misuse of government authority for “retribution against a private company that has displeased the leadership.”

The Pentagon took the action against Anthropic after an unusually public dispute over the company's refusal to allow unrestricted military use of its AI model Claude. President Donald Trump also said he was ordering all federal agencies to stop using Claude.

“The use of a supply chain risk designation to address a contract dispute may bring severe economic effects that are not in the public interest,” Microsoft, a major government contractor, said in its Tuesday filing in the San Francisco federal court, where Anthropic sued the Trump administration on Monday.

The Pentagon's action “forces government contractors to comply with vague and ill-defined directions that have never before been publicly wielded against a U.S. company,” Microsoft's legal brief says.

It asks for a judge to order a temporary lifting of the designation to allow for more “reasoned discussion” between Anthropic and the Trump administration.

The Pentagon declined to comment, saying it does not remark on matters in litigation.

Microsoft's filing also expressed support for Anthropic's two ethical red lines that were a sticking point in the contract negotiations after the Pentagon insisted the company must allow for “all lawful” uses of its AI.

“Microsoft also believes that American AI should not be used to conduct domestic mass surveillance or start a war without human control,” the company said. “This position is consistent with the law and broadly supported by American society, as the government acknowledges.”

The software giant's court filing followed others supporting Anthropic, including one from a group of AI developers at Google and OpenAI, and another from a group of organizations such as the Cato Institute and the Electronic Frontier Foundation.

A fourth such filing came from the group of retired military chiefs that includes former CIA director Michael Hayden, who's also a retired Air Force general, and retired Coast Guard Adm. Thad Allen, who led the government response to Hurricane Katrina.

“Far from protecting U.S. national security, the Secretary’s conduct here threatens the rule-of-law principles that have long strengthened our military,” said their filing.

U.S. District Judge Rita Lin is presiding over the case in federal court in San Francisco, where Anthropic is headquartered. Anthropic has also filed a separate and more narrow case in the federal appeals court in Washington, D.C.

Lin, who was nominated to the bench by President Joe Biden in 2022, has scheduled a March 24 hearing.

Neither legal filing mentions the war in Iran, which started shortly after Trump and Hegseth announced they were punishing Anthropic, but the ex-military officials warn that the “sudden uncertainty” of targeting a technology widely embedded in military platforms could disrupt planning and put soldiers at risk during ongoing operations.

The current commander of U.S. Central command confirmed in a video posted to social media Wednesday about U.S. strikes on Iran that the military was using “advanced AI tools” to “sift through vast amounts of data in seconds,” though he didn't specifically name which tools.

Adm. Brad Cooper said these AI tools are enabling leaders to make smarter decisions faster but stressed that “humans will always make final decisions on what to shoot and what not to shoot and when to shoot.”

Anthropic was, until recently, the only one of its peers approved for use in classified military networks. But as a result of the dispute, military officials have said they're looking to shift that work to competitors Google, OpenAI and Elon Musk's xAI.

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AP writer Konstantin Toropin contributed to this report.

Pages from the Anthropic website and the company's logo are displayed on a computer screen in New York on Thursday, Feb. 26, 2026. (AP Photo/Patrick Sison)

BOISE, Idaho (AP) — Former Los Angeles police detective Mark Fuhrman, who was convicted of lying during testimony at the OJ Simpson murder trial, has died. He was 74.

Fuhrman was one of the first two police detectives sent to investigate the 1994 killings of Simpson’s ex-wife Nicole Brown Simpson and her friend, Ronald Goldman, in Los Angeles. He reported finding a bloody glove at Simpson’s home but his credibility came under attack during the trial as the defense raised the prospect of racial bias.

Under cross-examination, Fuhrman testified that he had never made anti-Black racial slurs in the past decade, but a recording showed he had done so repeatedly.

Lynn Acebedo, the chief deputy coroner in Kootenai County, Idaho, said that Fuhrman died May 12. The county does not release the cause of death as a rule.

Alan Dershowitz, a prominent lawyer and law professor who was a legal strategist on Simpson’s defense “Dream Team,” said Fuhrman was a “much better detective than he was a witness.”

“He’s very smart, and you know, a very, very aggressive detective. Ultimately his actions helped us win the O.J. case because of his use of the ‘n’ word,” Dershowitz said Monday evening. “I got to know him later, after it was all over, and we had a cordial relationship.”

Fuhrman retired from the Los Angeles Police Department after Simpson’s 1995 acquittal. He subsequently moved to Idaho with his family and set up a 20-acre (eight-hectare) farm, raising chickens, goats, sheep and llamas.

In 1996, Fuhrman was charged with perjury and pleaded no contest. He later became a TV and radio commentator and wrote the book “Murder in Brentwood” about the killings.

A criminal-court jury found Simpson, a former star NFL running back and actor, not guilty of murder in 1995, but a separate civil trial jury found him liable in 1997 for the deaths and ordered him to pay $33.5 million to relatives of Brown and Goldman. He served nine years in prison on unrelated charges and died in Las Vegas of prostate cancer in 2024 at the age of 76.

Fuhrman’s father left when he was 7 years old, and Fuhrman often cared for his younger brother while his mother worked. As an adult, he joined the Marines and then the Los Angeles Police Department.

Golden reported from Seattle.

FILE - In this June 15, 1995 file photo, O.J. Simpson, left, grimaces as he tries on one of the leather gloves prosecutors say he wore the night his ex-wife Nicole Brown Simpson and Ron Goldman were murdered in a Los Angeles courtroom. (AP Photo/Sam Mircovich, Pool, File)

FILE - Los Angeles Police Department Det. Mark Fuhrman, foreground, and Superior Court Judge Lance Ito, rear, crane their heads to look at an overhead monitor during the O.J. Simpson double-murder trial, Friday, March 10, 1995, in Los Angeles. (AP Photo/Reed Saxon, File)

FILE - Los Angeles Police Detective Mark Fuhrman shows the jury in the O.J. Simpson double murder trial evidence during testimony Friday, March 10, 1995, in Los Angeles. (AP Photo/Nick Ut, Pool, File)