Chinese authorities summoned Nvidia Corp. to discuss alleged security risks related to its H20 chips, casting doubt over the domestic business of the world’s most valuable company weeks after co-founder Jensen Huang met senior officials in Beijing.

Nvidia earlier this month said the U.S. government is giving permission to sell its H20 microchip again in China — but now a Chinese regulator is raising a red flag.

This week, the country's top internet watchdog summoned Nvidia reps over what it calls serious security risks tied to the H20 chipa product Nvidia designed specifically to meet U.S. export rules. State media pulled no punches either.