The US Department of Homeland Security order banning DeepSeek from civilian federal agencies was dated July 24, 2026 and signed by Homeland Security Secretary Markwayne Mullin

In October 2026, the US Department of Homeland Security made public a July 2026 order that removes Chinese AI company DeepSeek's products, and third-party services built on its models, from civilian federal agency IT systems and bars agencies from buying them, citing national security and data risks.