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Microsoft backs Anthropic in lawsuit against Trump admin

Microsoft supports Anthropic's lawsuit to halt Pentagon's supply-chain risk label, citing potential costly disruptions to defense contractors and military AI integration.

  • This week, Microsoft filed to pause the Pentagon's supply‑chain determination, saying it affects business by integrating Anthropic's AI into technologies used by the U.S. military.
  • Anthropic rejected demands that it permit unrestricted military use and insisted its policy bars autonomous weapons and mass surveillance, after Trump ordered agencies to cease using Claude.
  • Anthropic's lawsuit says the government's actions are 'unprecedented and unlawful' and warned of immediate harm and 'unrecoverable revenue losses' amid more than 500 customers paying at least $1 million annually and a valuation of $380 billion.
  • Microsoft warned that without a temporary restraining order, contractors could face costly defense-supply disruptions, while Anthropic filed suits in California and Washington, D.C., to block President Donald Trump's order.
  • Industry filings and actions show more than 30 AI developers at OpenAI and Google, including Jeff Dean, filed an amicus brief supporting Anthropic while the Pentagon and rivals shift work to Google's Gemini, OpenAI's ChatGPT, and Elon Musk's xAI .
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Politico broke the news in on Monday, March 9, 2026.
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