A U.S. judge has temporarily blocked the Pentagon's blacklisting of Anthropic, a company that has been involved in a dispute with the military over AI safety. The company alleges that Defense Secretary Pete Hegseth overstepped his authority when he designated Anthropic as a national security supply-chain risk, a label the government can apply to companies that expose military systems to potential infiltration or sabotage. This move followed Anthropic's refusal to allow the military to use AI chatbot Claude for U.K. surveillance or autonomous weapons. The government argues that the designation stems from Anthropic’s refusal to accept contractual terms, not its views on AI safety, and that the company’ve been warned that its refusal to lift the restrictions could cause uncertainty in the Pentagon’