The president appeared on Fox's Tucker Carlson Tonight for what the White House described as an on-air "medical evaluation" conducted remotely by Fox contributor doctor Marc Siegel.
Polls show Biden leads heavily in key demographics including women and the elderly, prompting analysts to talk increasingly of a possible landslide victory.
Trump was eager to return to the campaign trail, telling aides that he wanted a series of mega rallies in Republican-friendly areas in battleground states to mark his recovery.