Warren Calls Pentagon's Anthropic Blacklist "Retaliation"
Senator Elizabeth Warren is accusing the Pentagon of retaliating against Anthropic after the Defense Department designated the AI company a national security "supply chain risk" last month. In a letter to Defense Secretary Pete Hegseth dated March 23, Warren called the move "retaliation" rather than a legitimate security decision, arguing the DoD could have simply terminated its contract instead.
The designation bars Anthropic from new military contracts and follows stalled negotiations over AI safeguards. Anthropic is currently suing the DoD, claiming the designation violates its First Amendment rights by punishing its ethical stance. A hearing on a preliminary injunction occurred on March 24, 2026, in San Francisco.
The Stakes
The dispute centers on Anthropic's refusal to allow its AI systems for uses like mass surveillance of Americans or fully autonomous weapons. The company, known for its safety-focused approach, has restrictions on how its models can be deployed. The Pentagon's designation effectively blacklist the company from sensitive government work.
"The decision to label Anthropic a 'supply-chain risk' appears to be retaliation against the company for its ethical stance on AI development," Warren wrote. She demanded documentation on the decision's basis, any political influences, and details on OpenAI's recent DoD contract terms, with responses due by April 6, 2026.
Shifting Contracts
The Pentagon has shifted to alternatives like OpenAI and xAI (Elon Musk's firm). Despite Warren's separate concerns over xAI's safety risks—such as generating harmful content—its Grok model gained access to classified networks, replacing Anthropic's prior role in sensitive operations.
Supporters including OpenAI, Google, Microsoft employees, and civil rights groups have filed amicus briefs backing Anthropic. President Trump directed federal agencies to cease using Anthropic's systems following the designation.
The controversy highlights the tension between AI safety priorities and military procurement priorities as the government increasingly relies on AI companies for defense applications.