In a surprising reversal of the United States’ years-long technology restrictions on China, President Donald Trump last month allowed Nvidia to resume sales of a key AI chip designed specifically for the Chinese market.

For years, the US has restricted the sale of powerful AI chips to China. But Trump is letting sales of less-advanced chips happen.

The move could open the door to China securing more advanced computing power from the U.S. even as the two countries battled for technology supremacy, critics said.