House Foreign Affairs Committee Chairman Brian Mast told ABC News he is prepared to subpoena Nvidia CEO Jensen Huang if the executive does not respond by Wednesday to a request for a closed-door congressional briefing on his relationship with suspected Chinese intelligence operative Alice Huang. Mast and the Republican chairs of the House Intelligence and China committees sent a letter last week asking Huang to appear on Nov 18 to address his ties to the former Megaspeed executive and Nvidia’s security protocols against foreign espionage.

The subpoena warning comes as The Information reported Tuesday that a corporate network run by Alice Huang, her husband Kang Wei, and her sister—centered on China-based Shanghai Century Litong—facilitated at least $7.5 billion in shipments of roughly 240,000 Nvidia AI chips to Chinese buyers since 2023. Separately, Bloomberg reported that Nvidia inventory figures given to the US government undercounted chips sold to Singapore-based Megaspeed via hardware partners by 50,000 units, and that Nvidia General Counsel Tim Teter contacted Commerce Under Secretary Jeffrey Kessler last year to ask about the agency’s Megaspeed smuggling probe before the inquiry was halted and referred to the Justice Department.