US Judge Blocks Trump Administration from Labeling Anthropic as 'Supply Chain Risk'

Anthropic wins preliminary injunction against Pentagon blacklisting.

Mar. 27, 2026 at 3:37pm by Ben Kaplan

Got story updates? Submit your updates here. ›

A federal judge in San Francisco has granted Anthropic's request for a preliminary injunction, temporarily blocking the Trump administration from enforcing its ban on the AI startup's Claude models and declaring Anthropic a 'supply chain risk' due to national security concerns.

Why it matters

The ruling is a significant win for Anthropic, which had argued the government's actions could cost the company billions and violate its constitutional rights. The case highlights the tensions between tech companies and the government over the use of AI technology.

The details

Anthropic filed the lawsuit after being blacklisted by the Pentagon and declared a 'supply chain risk' by Defense Secretary Pete Hegseth. President Trump had ordered federal agencies to stop using Anthropic's technology. In her order, Judge Rita Lin criticized the government's actions, calling them 'classic illegal First Amendment retaliation' and said the Pentagon's designation of Anthropic appeared 'arbitrary and capricious'.

  • On March 25, 2026, a tense hearing was held between Anthropic's lawyers and government attorneys.
  • On March 27, 2026, Judge Rita Lin granted Anthropic's request for a preliminary injunction.

The players

Anthropic

An AI startup that refused to allow its Claude AI models to be used for fully autonomous weapons or domestic mass surveillance, leading to a standoff with the Pentagon.

Judge Rita Lin

A federal judge in San Francisco who granted Anthropic's request for a preliminary injunction, temporarily blocking the Trump administration's actions against the company.

Pete Hegseth

The Defense Secretary who declared Anthropic a 'supply chain risk'.

Donald Trump

The former President who ordered federal agencies to stop using Anthropic's technology.

Got photos? Submit your photos here. ›

What they’re saying

“Nothing in U.S. law supports branding an American company as a potential adversary simply for disagreeing with the government.”

— Judge Rita Lin, Federal Judge

“We are grateful the court acted swiftly, and our focus remains on working productively with the government to ensure safe and reliable AI for all Americans.”

— Anthropic

What’s next

The case is far from over, with a final verdict months away. However, the injunction is a significant win for Anthropic, as it continues to challenge the administration's directives in court.

The takeaway

This case highlights the ongoing tensions between tech companies and the government over the use of AI technology, and the importance of protecting constitutional rights even in the face of national security concerns.