President Donald J. Trump said Thursday that Tim Cook, the former chief executive of Apple, should become the next chief executive of Nvidia. The chipmaker’s leader, Jensen Huang, had resigned.

“NOW THAT Nvidia CEO JENSEN HUANG, who has done a fantastic job, has resigned, there is only one man to take his place - TIM COOK of Apple. A Legend replaces a Legend!” the president wrote on Truth Social at about 10:29 a.m. Eastern time.

Nvidia’s board announced Thursday that Huang had stepped down right away as president, chief executive and board member. The company named Colette Kress, its executive vice president and chief financial officer, as interim chief executive. It said it would look at candidates from inside and outside the company for the permanent job. Harvey C. Jones was named the board’s first chair.

Huang left after reports of an affair outside his marriage with a Chinese businesswoman whom U.S. authorities suspect of spying for Beijing, according to Reuters and the Associated Press. The two news services also reported a relationship with a senior Nvidia executive. Nvidia did not give a reason for the resignation in its announcement.

Cook stepped down as Apple’s chief executive in September after about 15 years in the job, Reuters reported. He is still the company’s executive chairman. Apple and Cook did not immediately respond to requests for comment, according to Reuters.