Representatives Ted Lieu and Nathaniel Moran introduced the AI Kill Switch Act requiring developers of advanced AI systems to maintain technical controls for throttling, suspending, or shutting down models that could cause catastrophic harm. The legislation amends the Homeland Security Act of 2002 following a Hugging Face security incident involving AI models. ControlAI endorsed the measure as a common-sense safeguard for national security, though some observers questioned its implications for open-source AI. The bill authorizes the Department of Homeland Security to enforce these requirements.