Jensen Huang, the chief executive of Nvidia, has become a technology industry superstar. He joined President Trump on a state visit to Britain this week.
A lucrative transaction involving the Trump family’s cryptocurrency firm and an agreement giving the Emiratis access to A.I. chips were connected in ways that have not been previously reported.
President Trump has become the semiconductor sector’s leading decision maker, from new fees on exports to China to a brief demand for a C.E.O.’s firing.