Donald TrumpDonald John TrumpWhite House counsel called Trump 'King Kong' behind his back: report Trump stays out of Arizona's ugly and costly GOP fight Trump claims he instructed White House counsel to cooperate with Mueller MORE on Saturday called for himself and Hillary ClintonHillary Diane Rodham Clinton‘Prosperity and peace’ is the winning Republican theme for midterms Mueller recommends Papadopoulos be sentenced to up to 6 months in prison Poll: Dem opponent leads Scott Walker by 5 points MORE to take a drug test prior to the third presidential debate.

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During a campaign rally Saturday in New Hampshire, the GOP presidential nominee compared himself and Clinton to athletes.

"Athletes, they make them take a drug test, right. I think we should take a drug test prior to the debate," Trump said.

"Why don't we do that? We should take a drug test, prior, because I don't know what's going on with her, but at the beginning of her last debate, she was all pumped up at the beginning, and at the end it was like, 'Oh, take me down,' " Trump said, imitating Clinton.

"She could barely reach her car.'"

Trump said he was willing to take drug test.

The GOP nominee often raises questions about whether Clinton has the stamina and strength to serve as president. 

Trump and his allies have long floated conspiracy theories about Clinton's health throughout the GOP nominee's campaign.

In an ad released last week, Trump painted Clinton as unfit to protect the country and featured footage of her stumbling into a van when she fell ill at a 9/11 memorial ceremony in New York.