Senate Commerce Chair Ted Cruz has postponed a classified briefing on artificial intelligence and cybersecurity that was scheduled for Tuesday and expected to include a Commerce Department official facing scrutiny over his dealings involving chipmaker Nvidia.

Jeffrey Kessler, the undersecretary of Commerce for industry and security, was among the administration officials listed to brief senators, according to an email from Cruz’s staff to committee members reviewed by POLITICO. The Texas Republican’s plan to hold the briefing had not previously been reported.

The private session was to cover recent cybersecurity breaches, including the hacking of AI platform Hugging Face by rogue OpenAI agents, as well as potential congressional responses to risks arising from rapid advances in artificial intelligence.

“The topics will include: Mythos (pre-, during, and post-), federal government awareness of non-public loss-of-control events (Hugging Face incident), and potential congressional action for new authorities, among others,” the email said. Mythos is an advanced Anthropic model thought capable of breaching previously secure cyber systems.

The delay comes as lawmakers consider federal AI safety standards and oversight. Efforts to reach a legislative agreement collapsed before the November midterms and are expected to resume in earnest in the new Congress, when Democrats will control both chambers.

Kessler has become a figure of interest in the Nvidia controversy after the company fired CEO Jensen Huang this week following the disclosure of his affair with an alleged Chinese spy. The New York Times reported that Kessler intervened in an internal Commerce Department investigation of Megaspeed, a Singaporean firm led by the alleged spy and a major buyer of advanced Nvidia chips. Kessler’s responsibilities include AI export controls.

Also listed as expected briefers were Ethan Klein of the Office of Science and Technology Policy and Sean Cairncross, director of the Office of the National Cyber Director.

Spokespeople for Cruz and the Commerce Department did not immediately respond to requests for comment. Asked Thursday whether his panel would examine Commerce’s role in the Nvidia matter, Cruz said the committee “has engaged in vigorous oversight under Republican presidents and Democratic presidents.”