Trump fights back after Harris questions whether he is 'exhausted'

GRAND RAPIDS, Mich. (AP) — Donald Trump's energy level emerged as a flashpoint on Friday as the Republican nominee and Democrat Kamala Harris scrambled across battleground Michigan with Election Day looming.

Harris told reporters that Trump was “unfit," “unstable” and “a danger to our democracy” ahead of an afternoon rally. But she appeared to touch a nerve with her Republican rival when she mentioned a report that Trump was “exhausted."

“Being president of the United States is probably one of the hardest jobs in the world and we really do need to ask, if he’s exhausted on the campaign trail, is he fit to do the job?” jabbed Harris, who has been on the road campaigning since Monday and won’t return to Washington until sometime next week.

Harris' attack comes as she seeks to raise doubts about Trump's health over the final days of the campaign. Trump, at 78, would be the oldest person in U.S. to become the president if he wins. But he's refused to release his medical records or other health details, breaking decades of tradition in presidential politics.