The comments made to CNN, if taken at face value, seemed to fly in the face of the California governor’s presidential ambitions.

Senator Mitch McConnell, the 84-year-old Kentucky Republican and former leader, had been absent for more than 13 weeks after a health incident, fueling questions about his ability to continue serving.

Mr. Trump called Jensen Huang, Nvidia’s chief executive, while Mr. Huang was onstage in Los Angeles and criticized calls to slow down and regulate A.I.