Treasury secretary questions whether the chipmaker pursued illicit AI chip sales and points to export-control scrutiny as the board searches for a permanent chief executive.
Treasury secretary says chipmaker's board must answer export-control questions within 10 days after Jensen Huang's resignation.
Lawmakers from both parties want chip-control measures folded into the annual defense bill, days before Trump meets Xi Jinping.
The pact, part of the State Department's Pax Silica effort, sets a joint list of critical technologies to protect ahead of a Trump-Xi meeting in Shenzhen.
Singapore-based Megaspeed is accused of passing advanced Nvidia chips to unauthorized Chinese buyers, exposing a loophole in US export controls on AI hardware.
The Nvidia founder and CEO stepped down after reported affairs, one with a woman U.S. intelligence concluded was a Chinese spy, thrusting the AI chipmaker into its biggest crisis.
Nvidia's board launched an independent investigation into CEO Jensen Huang's relationship with a woman U.S. officials suspect of spying, as lawmakers push tighter China chip rules.