tl;dr: US intelligence agencies concluded that Alice Huang, a Chinese executive at Singapore-based Nvidia customer Megaspeed, cultivated a close relationship with Nvidia CEO Jensen Huang while allegedly funneling information to Beijing, according to a New York Times report. Trump was briefed on the findings about a year ago but declined to act, reportedly to avoid disrupting Nvidia's chip business and US-China trade. Nvidia denies anything improper, calling the interactions routine customer meetings, while Megaspeed is separately under US investigation for allegedly helping Chinese firms evade export controls on advanced Nvidia chips.