Chinese tech firms are barred from purchasing California-based Nvidia's most cutting-edge AI chips under US export controls that Washington says are intended to protect national security.

Jensen Huang will skip the Trump-Xi summit as the White House sidelines tech talks, while Elon Musk and Tim Cook are expected to attend.

Huang’s absence from Trump’s China trip could hurt his push to sell AI chips in a market he has called a $50 billion opportunity.