According to DeepLearning.AI, after the U.S. cleared Nvidia and AMD to resume AI chip sales, Chinese authorities ordered a security review of Nvidia's H20 and urged local firms to buy domestic GPUs (source: DeepLearning.AI tweet, Aug 22, 2025). Officials also probed alleged backdoor risks in the H20, which Nvidia disputes (source: DeepLearning.AI tweet, Aug 22, 2025). The source highlights concrete actions by Chinese authorities toward Nvidia's H20 and procurement guidance for local firms that are directly tied to AI chip sales into China (source: DeepLearning.AI tweet, Aug 22, 2025).