Bill Clinton to replace Hillary at Las Vegas event Wednesday
© Greg Nash

Bill ClintonWilliam (Bill) Jefferson ClintonSeveral factors have hindered 'next up' presidential candidates in recent years Criminal justice includes food security — we can't ban the social safety net Rosy economic data belies a harsh reality for many Americans MORE will campaign on behalf of Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonTop Dem: Trump helps GOP erase enthusiasm gap; Ohio a big problem The Hill's 12:30 Report: Trump threatens jail time over 'treason' and 'spying' Several factors have hindered 'next up' presidential candidates in recent years MORE on Wednesday, as she recovers from pneumonia with a few days off from the campaign trail.

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The former president will fill in for his wife at her previously scheduled rally in Las Vegas on Wednesday, where he will discuss her economic plans, according to the campaign. Clinton canceled events Monday and Tuesday in California so she can rest after falling ill on Sunday.

Clinton was diagnosed with pneumonia on Friday, but didn’t disclose her illness until video surfaced of her becoming “overheated” at a 9/11 memorial in New York City and stumbling into a van.  

In her first interview since falling ill, Clinton called into CNN on Monday night and downplayed her diagnosis by saying she didn’t think “it was going to be that big a deal.”

Clinton didn't say specifically when she'd return to the campaign trail, other than to tell CNN’s Anderson Cooper that it will be "in the next couple of days."

"Obviously I was supposed to rest five days," Clinton said Monday night. "That’s what they told me on Friday, and I didn’t follow that very wise advice."

"I'm feeling so much better, and obviously, I should have gotten some rest sooner. I probably would have been better off if I pulled my schedule Friday, but like a lot of people, I thought I could keep going and power through it, and that didn't go so well."