Former President Bill Clinton said Monday that his wife has fallen before due to dehydration.

Revealing some of her health past for the first time, Clinton told CBS:

"Rarely, on more than one occasion, over the last many, many years, the same sort of thing's happened to her when she got severely dehydrated."

Speaking to CBS This Morning co-host Charlie Rose, the former president said Hillary Rodham Clinton is "fine" after her buckling on Sunday and ready to get back on the campaign trail, though aides said it won't happen for days.

With his typical aw shucks tone, he said, " I'll be lucky to hold her back another day."

The transcript is below from CBS:

BILL CLINTON: She's doing fine. She was even better last night before she went to sleep. She had a good night's sleep. She just got dehydrated yesterday.

CHARLIE ROSE: Is that what happened? She just got dehydrated. Because when you look at that collapse, that video that was taken, you wonder if it's not more serious than dehydration.

BILL CLINTON: Well, if it is then it's a mystery to me and all of her doctors. Rarely, on more than one occasion, over the last many, many years, the same sort of thing's happened to her when she got severely dehydrated, and she's worked like a demon, as you know, as Secretary of State, as a senator, and in the year since.

CHARLIE ROSE: But more importantly, she's on a grueling campaign. And you know what that's like, and she older than you when you ran.

BILL CLINTON: And she had two-and-a-half hard days before the day when she got dizzy. Today she made a decision, which I think was correct, to cancel her campaign day to take one more day to rest.

CHARLIE ROSE: Is it possible she'll be away for weeks from the campaign trail?

BILL CLINTON: No, not a shot. I'll be lucky to hold her back another day.

Paul Bedard, the Washington Examiner's "Washington Secrets" columnist, can be contacted at pbedard@washingtonexaminer.com