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"His latest paranoid fever dream is about my health. All I can say is, Donald, dream on," she said during a speech Thursday in Nevada.

"This is what happens when you treat the National Enquirer like gospel. They said in October I'd be dead in six months."

The Democratic nominee went on to connect Trump, who regularly questions whether she has the "mental and physical stamina" to be president, to a series of conspiracy theories touted by his supporters.

"It’s what happens when you listen to the radio host Alex Jones, who claims that 9/11 and the Oklahoma City bombings were inside jobs. He said, and this is so disgusting, the victims of the Sandy Hook massacre were child actors and no one was actually killed there," Clinton said.

"I don't know what happens in somebody's mind or how dark their heart must be to say things like that, but Trump doesn't challenge those lies."

Rumors about Clinton's health have swirled among conservative websites, including Breitbart News, the site whose executive editor recently joined Trump's campaign as its CEO.