Microsoft backs Anthropic in amicus brief to halt US DOD's 'supply-chain risk' designation - Reuters

Reuters
March 10, 2026
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2 min read

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Microsoft supports Anthropic's challenge to a DOD designation that could block it from government contracts.

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Microsoft has filed an amicus brief supporting Anthropic's challenge to the U.S. Department of Defense's (DOD) 'supply-chain risk' designation. This designation, applied by the DOD, could restrict Anthropic from bidding on government contracts. Microsoft's brief argues that the DOD's process for making such designations lacks transparency and due process. The technology giant contends that this opaque process could harm innovation and competition within the defense sector. The outcome of this legal challenge could set a precedent for how the DOD assesses and designates companies as supply-chain risks.

What's Being Done

Microsoft has filed an amicus brief supporting Anthropic's challenge to the U.S. Department of Defense's 'supply-chain risk' designation.

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