"Here's a woman, she's supposed to fight all these different things and she can't make it 15 feet to her car, give me a break," Trump said at a rally in Manheim, Pennsylvania.
The Republican presidential nominee repeatedly claimed that Clinton lacked sufficient stamina to serve as president.
On September 11, Clinton unexpectedly left the Sunday’s 9/11 tragedy anniversary service in New York City when she started to faint and was helped into her vehicle.
In early August, Clinton’s personal physician Lisa Bardack said that her patient was healthy.
Trump will be competing with Clinton for the US presidency at the elections scheduled for November 8. The candidates were nominated in July at their parties' respective conventions.