Key U.S. lawmakers on Thursday called for clarity on what the administration of U.S. President Donald Trump knew about Nvidia chief Jensen Huang’s extramarital affair with a woman suspected of spying for China, after the artificial intelligence chip giant announced his departure.

Huang, now Nvidia’s former CEO, had pushed for looser rules on sales of U.S. chips to China — crucial in the AI race — and the controversy has reenergized advocates of a hard line on Beijing, days before 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 U.S. national security at risk,” Senate Democratic leader Chuck Schumer said on social media.