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Federal Judge Rules Pentagon's Blacklisting of Anthropic Was 'Unlawful Retaliation'

Court finds supply chain risk designation violated First and Fifth Amendment rights; second lawsuit in Washington, D.C. still pending

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By LineZotpaper
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A federal judge in California ruled Thursday evening that the Pentagon's designation of AI firm Anthropic as a supply chain risk was illegal, finding it amounted to "unlawful retaliation" for the company's refusal to allow its models to be used in fully autonomous weapons and mass surveillance programs. U.S. District Judge Rita Lin said the Trump administration's actions violated Anthropic's First Amendment rights and denied the company due process under the Fifth Amendment.

U.S. District Judge Rita Lin concluded that Defense Secretary Pete Hegseth's labeling of Anthropic — the maker of the Claude AI models — as a national security risk was "arbitrary and capricious" and represented retaliation for "constitutionally protected activity." She also found Anthropic was denied due process, as required under the Fifth Amendment.

The dispute dates to earlier this year, when Hegseth and President Donald Trump labeled Anthropic a supply chain risk and ordered all federal agencies, including those outside defense, to stop working with the company. The designation followed Anthropic's insistence on safety guardrails that would prevent the Pentagon from using its models for fully autonomous weapons and mass surveillance of American citizens. The Pentagon denied that it would use Anthropic models for anything but lawful purposes, and alleged that Anthropic could try to control the military's use of models it had bought and paid for.

Lin pointed to contradictions in the government's position. She noted Hegseth's proposition to apply the Defense Production Act to Anthropic — a step that "would mean the company was essential to national security rather than a threat to it" — as well as the Department of Defense's continued pursuit of a contract with the company and its collaboration with Anthropic on a new model, Mythos, for cybersecurity. Lin also said Anthropic "undisputedly lacks" any backdoor access to its technology once it hands it over to the DOD.

"Though the Department of War is undisputedly free to select the AI vendor of its choice, the evidence demonstrates that the broad measures imposed on Anthropic were illegal and baseless," Lin wrote. "The empty invocation of national security is not a blank check to punish and retaliate against government critics."

She added that the government's "words and deeds confirm that the challenged actions were based on a desire to make a public example out of Anthropic for its 'arrogance' in criticizing the government."

Anthropic welcomed the decision. "We welcome the court's ruling that this supply chain risk designation was unlawful," a spokesperson said. "We remain focused on working productively with the government to harness AI for our national security so all Americans benefit from this technology."

Anthropic filed two complaints against the DOD in March, one in California and one in Washington, D.C. The D.C. suit is still ongoing.

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Analysis

Why This Matters

  • The ruling affirms that First Amendment protections apply to government contracting decisions, limiting the executive's ability to use national security labels to punish companies for their policy positions.
  • It is a test case for AI safety guardrails in defense contracting: a company refused certain military uses, and the government responded with a ban — the court has now rejected that response.
  • With a parallel D.C. lawsuit unresolved, the decision could shape how the Pentagon buys AI and how other vendors handle military-use restrictions.

Background

Anthropic's dispute with the Pentagon began when the company set hard lines on certain safety guardrails, refusing to allow its models to be used for fully autonomous weapons and mass surveillance of American citizens. The administration responded by designating Anthropic a supply chain risk and ordering federal agencies to stop working with it. The Pentagon maintained it would use the models only for lawful purposes and argued Anthropic was attempting to control how the military deployed technology it had purchased. Anthropic sued in March, contending the label was punishment for its safety stance rather than a genuine security determination.

Key Perspectives

Anthropic: The company says the designation was unlawful retaliation and has welcomed the ruling. It says it remains focused on working productively with the government on national security applications.

Administration and Pentagon: The government argued the designation was a lawful national security measure, denied any plan to use Anthropic's models for unlawful purposes, and claimed the company could not dictate military use of technology the Pentagon acquired.

Legal observers: The judge acknowledged the government remains free to choose its AI vendors, so the ruling does not strip the Pentagon of procurement discretion. However, it signals that national security justifications will not shield retaliatory actions from judicial review. The ongoing D.C. case will test whether similar reasoning applies there.

What to Watch

  • Whether the government appeals the California ruling or continues defending the parallel lawsuit in Washington, D.C.
  • Whether federal agencies resume contracts with Anthropic following the court's decision.
  • How the Pentagon handles safety guardrails in future AI procurement contracts with other vendors.

Sources

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