Donald TrumpDonald TrumpGiuliani used provisional ballot to vote in 2020 election, same method he disparaged in fighting to overturn results Trump gets lowest job approval rating in final days as president Fox News' DC managing editor Bill Sammon to retire MORE mocked Hillary ClintonHillary Diane Rodham ClintonJuan Williams: The real 'Deep State' is pro-Trump Rep. John Katko: Why I became the first Republican lawmaker to support impeachment Can we protect our country — from our rulers, and ourselves? MORE for stumbling during a 9/11 memorial event last month, imitating her fall that doctors chalked up to dehydration. 

It's a personal attack Republicans have warned Trump, the party's presidential nominee, to avoid. But while he has refused to engage on the issue, even publicly wishing her well, his tone changed Saturday night after an especially heated week.

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"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," he said during a rally in Manheim, Pa.
 
Trump then began to mimic Clinton, the Democratic presidential nominee, toppling over, stepping away from his microphone and pretending to stumble.
 
"She's home resting right now, getting ready for her next speech, which is going to be 15 minutes in about two to three days. Folks, we need stamina, we need energy, we need people that are going to turn deals around," Trump said.
 
Cellphone video of Clinton stumbling as aides led her to a car at a 9/11 memorial in New York City last month prompted the campaign to admit that she had been diagnosed with pneumonia, which ultimately led to dehydration. 
 
It played into conservative theories that Clinton is not as healthy as she claims. Trump allies have long questioned Clinton's health. 
 
But Clinton's staffers pushed back at those rumors by releasing more of Clinton's health records, including a note from her doctor outlining her care. 
 
The diagnosis led her to take a few days off from the campaign trail before returning. 

Trump has regularly questioned Clinton's stamina on the stump, and while he remained cordial in the aftermath of the September episode, wishing her well in a statement and in subsequent rallies, his allies continued to float those concerns, as well as conspiracy theories.

When Trump hit Clinton's "stamina" once again during Monday's presidential debate, Clinton struck back.

"As soon as he travels to 112 countries and negotiates a peace deal, a cease-fire, a release of dissidents, an opening of new opportunities in nations around the world, or even spends 11 hours testifying in front of a congressional committee, he can talk to me about stamina,” Clinton responded.