President Donald Trump’s administration has barred Nvidia Corp. from selling its H20 chip in China, an escalation of Washington’s tech battle with Beijing that will cost the company billions of dollars and hamstring a product line it explicitly designed to comply with previous US curbs.

Nvidia did not warn at least some major customers in advance about new U.S. export rules it was told about a week ago requiring it to obtain licenses to sell its China-focused artificial intelligence chip,

The restrictions are the first major limits the Trump administration has put on semiconductor sales outside the United States, toughening rules created by the Biden administration.