Mr. Trump also confirmed that Senator Marco Rubio was his choice to be secretary of state and said he had offered Tulsi Gabbard the job of director of national intelligence. Earlier he met with House Republicans and visited President Biden in the White House.

The last time Donald Trump was in the Oval Office, he scrawled out a two-page letter to Joe Biden in his distinctive jagged penmanship, slipped it into the drawer of the Resolute Desk and — notwithstanding the note’s surprisingly gracious tone — walked away from the building defeated and bitter.