Article continues below advertisementDonald Trump is letting everyone know he's doing just fine.On Tuesday, December 9, the president fired off a nearly 500-word Truth Social post pushing back hard on reports questioning his cognitive health after his rally speech in Pennsylvania. The criticism stemmed from a New York Times article highlighting how the 79-year-old - the oldest president ever elected - has cut down his public appearances by 39 percent compared to his 2016 campaign schedule.