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With 55 days until Election Day, a major issue dogging the Hillary Clinton campaign is the Democratic nominee's health.

Clinton will be back on the campaign trail Thursday after collapsing following an early exit from a 9/11 memorial service on Sunday.

Ed Klein, who has been sounding the alarm on Clinton's health for years, says that her collapse had nothing to do with her pneumonia diagnosis.

"This is much deeper than pneumonia," Klein told Steve Doocy on "Fox and Friends" today.

Klein said that Bill Clinton is aware of his wife's serious health problems and has "begged" her for years to go to the hospital and get a full medical check-up.

"She's refused to do so, because she's afraid if it leaks out," Klein said.

He added that's why video of Clinton collapsing is so damning, as it confirms rumors about her alleged poor health.

Klein described the former president as being "furious" when a video showed that his wife had collapsed, adding that he "begged" her not to go and offered to go in her place.

"He was afraid she'd collapse in public because she's been doing it in private. ... It's hard to argue with video," Klein said. "And up to now, the media has been in the tank for the Clintons, but they can't argue with this video."

"Even her friends don't know exactly what's wrong with her ... but they do know that there's something very seriously wrong with this woman."

Watch more above.

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