Trump calls Chinese startup DeepSeek's cheaper AI methods "a positive," as U.S. tech stocks plunge amid market sell-off.

U.S. President Donald Trump said on Monday that Chinese startup DeepSeek's technology should act as spur for American companies and said it was good that companies in China have come up with a cheaper,

Silicon Valley and Washington leaders said the app shows China can challenge the U.S. The Nasdaq lost 3 percent and chipmaker Nvidia shed $589 billion in market capitalization.