Former Nvidia CEO Jensen Huang had pushed to ease restrictions on US chip sales to China, a key battleground in the AI race. (EPA Images pic)WASHINGTON: Key US lawmakers on Thursday called for clarity on what the Trump administration knew about Nvidia chief Jensen Huang's extramarital affair with a woman suspected of spying for China, after the AI chip giant announced his departure.

Huang, now Nvidia's former CEO, had pushed for looser rules on sales of US chips to China -- crucial in the AI race -- and the controversy has reenergized advocates of a hard line on Beijing, days before Donald Trump travels to China.

"Despite Jensen Huang's resignation, Congress must demand answers from Mr. Huang and others at Nvidia about how they may have put US national security at risk," Senate Democratic leader Chuck Schumer said on social media.