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WASHINGTON (AP) 鈥� China’s cyberspace regulators on Thursday summoned Nvidia over security concerns that its H20 chips can be tracked and turned off remotely, the Cyberspace Administration of China said on its website.

In the meeting, Chinese regulators demanded that the U.S. chip company provide explanations on 鈥渂ackdoor safety risks鈥� of its H20 chips to be sold in China and submit relevant materials, the office said.

鈥淐ybersecurity is critically important to us. NVIDIA does not have 鈥榖ackdoors鈥� in our chips that would give anyone a remote way to access or control them,鈥� an Nvidia spokesperson said in a statement to AP.

It came just about two weeks after the Trump administration lifted the block on the computing chips and allowed Nvidia to resume sales of H20 chips to the Chinese market. Jensen Huang, chief executive of Nvidia, made the announcement with fanfare when he was in Beijing earlier this month.

The latest episode appears to be another turbulence in the tech rivalry between the United States and China, which have left businesses in both countries tussling with governments over market access and national security concerns.

Any safety concern by Beijing could jeopardize the sale of H20 chips in China. Citing unnamed U.S. AI experts, the Chinese regulators said Nvidia has developed mature technology to track, locate and remotely disable its computing chips. The regulators summoned Nvidia to 鈥渟afeguard the cybersecurity and data security of Chinese users,鈥� in accordance with Chinese laws, the statement said.

The statement also referred to a call by U.S. lawmakers to require tracking and locating capabilities on U.S. advanced chips sold overseas.

In May, Rep. Bill Huizenga, R.-Michigan, and Rep. Bill Foster, D.-Illinois, introduced the Chip Security Act that would require high-end chips to be equipped with 鈥渟ecurity mechanisms鈥� to detect 鈥渟muggling or exploitation.鈥� The bill has not moved through Congress since its introduction.

Foster, a trained physicist, then said, 鈥淚 know that we have the technical tools to prevent powerful AI technology from getting into the wrong hands.鈥�

The U.S. still bans the sale to China of the most advanced chips, which are necessary for developing artificial intelligence. Both countries aim to lead in the artificial intelligence race. The Trump administration in April blocked the sales of H20 chips, which Nvidia developed to specifically comply with U.S. restrictions for exports of AI chips to China.

After the ban was lifted, Nvidia expected to sell hundreds of thousands more H20 chips in the Chinese market.

But the easing of the ban has raised eyebrows on Capitol Hill. On Monday, a group of top Democratic senators, including Minority Leader Sen. Chuck Schumer, wrote to Commerce Secretary Howard Lutnick to express their 鈥済rave concerns”.

While chips like the H20 have differing capabilities than the most advanced chips such as Nvidia’s H100, 鈥渢hey give (China) capabilities that its domestically-developed chipsets cannot,鈥� the senators wrote.

Shortly after the ban was lifted, Rep. John Moolenaar, R.-Michigan, who chairs the House Select Committee on China, objected. 鈥淭he Commerce Department made the right call in banning the H20. Now it must hold the line,鈥� Moolenaar wrote in a letter to Lutnick.

鈥淲e can鈥檛 let the CCP use American chips to train AI models that will power its military, censor its people, and undercut American innovation,” Moolenaar wrote, referring to the Chinese Communist Party by its acronym.