The case centres on companies with Singapore and Malaysian links, and on whether US export limits on Nvidia hardware were circumvented.
Lutnick is due before the Senate Banking Committee in December as scrutiny of how advanced chips reach China intensifies.
The gap between Nvidia's private assurances and its trade body's public objections could shape how the Chip Security Act is written.
Lawmakers want closed-door and public sessions on national security risks in AI chip access, and Nvidia has a new interim CEO and first board chair.
Nvidia's finance chief will lead the company on an interim basis while shares dropped nearly 12% in early trading.
Practitioners are weighing open-weight and local models as frontier labs' guardrails tighten around reverse-engineering work.
Shares fell more than 4% on the first trading day after the investigation was announced, and a law firm is preparing a class action.
The request follows reports that Chinese intelligence targeted Huang through an associate at Megaspeed, a claim Nvidia and China both reject.
Nvidia rejects the spy allegations, and the reported case rests on how much hardware a small regional firm bought and who knew about it.