In its lawsuit, Anthropic said the designation was unlawful and violated its free speech and due process rights.

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Anthropic has filed a lawsuit to block the Pentagon from placing it on a US national security blacklist, escalating the artificial intelligence lab’s high-stakes battle with the administration of United States President Donald Trump over usage restrictions on its technology.

Anthropic said in its lawsuit on Monday that the designation was unlawful and violated its free speech and due process rights. The filing in federal court in the US state of California asked a judge to undo the designation and block federal agencies from enforcing it.