05:29 AM EDT, 03/11/2026 (MT Newswires) -- Microsoft ( MSFT ) filed a legal brief Tuesday urging a court to temporarily block the US government's decision to blacklist Amazon ( AMZN )-backed (AMZN) Anthropic over a dispute on uses of AI technology.

The Pentagon designated Anthropic a supply-chain risk last month and canceled its contracts after the company demanded guarantees that the military would not use its technology for autonomous warfare or domestic mass surveillance.

Microsoft ( MSFT ) said it has "a close business relationship with Anthropic" and incorporates its technologies into products that it provides the US military.

Microsoft ( MSFT ) said the immediate banning of Anthropic would be disruptive and urged a temporary restraining order which would "enable a more orderly transition and avoid disrupting the American military's ongoing use of advanced AI," the filing said.

A lack of an restraining order "could potentially hamper US warfighters at a critical point in time," the filing said.