New Delhi, Nov. 11 -- The 63-year-old is the leading face of the artificial intelligence revolution with his black leather jackets and fluff of grey hair. He runs the company Nvidia, which produces highly coveted computer chips. That's landed him on a late-night-phone-call basis with President Donald Trump, a promoter of the industry.

But Huang was also liaising with a Chinese businesswoman who has allegedly fed intelligence - as well as advanced chips - to China. The woman, Alice Huang, is a former executive at the Singapore-based cloud computing company Megaspeed.

It's a saga of personal betrayal, corporate espionage and high-tech development, and the fallout is spreading across Washington. There are bipartisan calls for investigation...