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.

US President Donald Trump has called Chinese AI start-up DeepSeek's strong showing a "wake-up call" and "positive" for America's tech sector, and also warned that he would slap tariffs on foreign-made semiconductor chips,

These days, nothing is certain about the tech market or the world at large. Even Nvidia's seemingly bulletproof stock took a hammering on Monday, enduring