In a move signaling growing concern over China’s access to advanced AI technology, major U.S. tech companies Amazon and Microsoft are supporting legislation aimed at restricting exports of high-end chips from Nvidia to China, according to a report by the Wall Street Journal on Thursday. AI startup Anthropic is also reported to back the initiative.

The legislation, known as the GAIN AI Act—short for Guaranteeing Access and Innovation for National Artificial Intelligence—was introduced as part of the National Defense Authorization Act. It would require AI chipmakers to prioritize domestic orders for advanced processors before supplying international customers. The measure is designed to ensure U.S. competitiveness in artificial intelligence and mitigate perceived national security risks from foreign access to cutting-edge computing hardware.

While Microsoft has publicly endorsed the Act, Amazon reportedly conveyed its support privately to Senate staffers. Tech giants such as Meta Platforms and Alphabet’s Google have yet to take a position, and the U.S. President has not publicly commented on the legislation, the report noted.

Some White House officials, including AI czar David Sacks, have cautioned that the policy’s practical impact may be limited, given that the Commerce Department already regulates chip exports.

Nvidia, the world’s leading chipmaker, has previously warned that the GAIN AI Act could restrict global competition for advanced processors and reduce the availability of computing power to other countries, potentially slowing international AI development.

The legislation reflects a broader U.S. strategy to secure domestic access to cutting-edge AI technology amid fears that China could leverage high-end computing capabilities to advance its military programs.

Attempts to verify the report were ongoing, with Amazon declining comment, and Microsoft, Anthropic, and the White House not immediately responding to inquiries.