Elizabeth Warren calls Pentagon’s decision to bar Anthropic ‘retaliation’

by | Mar 23, 2026 | Technology

Anthropic is attracting an increasing number of supporters in its fight against the U.S. Department of Defense, which last month designated the AI lab as a supply-chain risk after it refused to make concessions on how its AI could be used by the military.

In a letter to Defense Secretary Pete Hegseth, U.S. Senator Elizabeth Warren (D-MA) equated the DoD’s decision with “retaliation,” arguing that the Pentagon could simply have terminated its contract with the AI lab, CNBC reports.

“I am particularly concerned that the DoD is trying to strong-arm American companies into providing the Department with the tools to spy on American citizens and deploy fully autonomous weapons without adequate safeguards,” Warren wrote, per the report, adding that the barring of Anthropic “appears to be retaliation.”

Warren’s words echo many other organizations that have spoken out against the Defense Department’s treatment of Anthropic. Several tech companies and employees — including from OpenAI, Google and Microsoft — as well as legal rights groups, have filed amicus briefs in support of Anthropic and denouncing the designation, which is usually applied to foreign adversaries and not U.S. firms. 

The dispute arose after Anthropic told the Pentagon that it did not want its AI systems to be used for mass surveillance of Americans, and that the technology wasn’t ready for use in targeting or firing decisions of lethal autonomous weapons without human intervention. The Pentagon contested that a private company shouldn’t dictate how the military uses technology, and soon after designated the company as a “supply-chain risk.” The label requires any company or agency that does work with the Pentagon to certify that it doesn’t use the designated company’s products or services — effectively barring Anthropic from working with any company that also works with the U.S. government.

The letter from Warren comes a day before a hearing in San Francisco on Tuesday, when District Judge Rita Lin will decide whether to grant Anthropic a preliminary injunction that seeks to preserve the status quo while its case against the DoD is litigated.

While Anthropic is suing the DoD for infringing on its First Amendment rights and punishing the company based on ideological grounds, t …

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