Trump banned federal use of Anthropic’s AI Claude over security concerns, prompting contractors to phase it out despite ongoing military use.

In March 2026, President Trump banned all federal agencies from using Anthropic’s AI system Claude, citing national security risks after the company refused to grant the military unrestricted access. The Pentagon labeled Anthropic a "supply-chain risk," blocking defense contractors from doing business with it, though the military continues using Claude in active operations. Lockheed Martin announced a six-month phase-out of the tool, joining other contractors in complying with the directive. Anthropic plans to challenge the ban in court, calling it legally unfounded, while OpenAI secured a Pentagon contract amid ongoing scrutiny over AI ethics and military use.