Chris Fall, the Trump administration’s top AI security official, has left after just three months on the job, according to a Commerce Department spokesperson.

Fall, who was director of the AI ​​Standards and Innovation Center, has been at the center of the federal government’s voluntary review process of frontier AI models. CAISI is a Department of Commerce agency that serves as a key point of contact for the industry and spearheads commercial AI testing and research.

His departure comes as the White House and lawmakers across the country grapple with how to regulate emerging technology.

“Following Chris’ departure, NIST Director Dr. Arvind Raman will continue to oversee CAISI and will serve as acting director of CAISI,” the spokesperson told POLITICO, which, like Business Insider, is part of the Axel Springer Global Reporters Network.

Raman is also leading the search for a new permanent CAISI director to be announced in the coming weeks, and Commerce Secretary Howard Lutnick wants someone with deep knowledge and experience in AI, said a Commerce official granted anonymity to discuss personnel issues.

After Commerce imposed export controls on Anthropic in June, Fall was closely involved in discussions with Anthropic’s top executives about restoring access to the company’s advanced Fable 5 and Mythos 5 models, POLITICO previously reported.

He was appointed to lead CAISI in April and was an Energy Department official during Trump’s first term.

Axios previously reported details of Fall’s departure.

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