March 10 (Reuters) - Microsoft ( MSFT ) filed on Tuesday a proposed brief in support of Anthropic's lawsuit asking the court to temporarily block the U.S. Department of Defense's designation of the AI startup as a supply-chain risk.

Microsoft ( MSFT ) added that it was directly impacted by the DOD's designation.

The Claude maker had filed a lawsuit to block the Pentagon from placing it on a national security blacklist on Monday, escalating a high-stakes battle with the U.S. military over usage restrictions on its technology.

Microsoft's ( MSFT ) filing argued the TRO is needed to prevent costly disruptions for suppliers, who would otherwise have to rapidly rebuild offerings that rely on Anthropic's products.