The move came two weeks after the Trump administration reversed course to allow Nvidia to sell the coveted artificial intelligence chips in China.

Nvidia said on Thursday its products have no "backdoors" that would allow remote access or control after China raised concerns over potential security risks in the firm's H20 artificial intelligence chip.

China state media is calling for Nvidia Corp. to prove that its H20 chip is secure, saying it can’t allow flawed chips into the country.China’s top internet watchdog summoned Nvidia representatives earlier this week to discuss what Chinese officials called significant security vulnerabilities in the H20.