Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE’s campaign announced Sunday night it was canceling a planned swing through California on Monday and Tuesday.

WHITE PLAINS, N.Y. (AP) _ Hillary Clinton cancels plans to travel to West Coast Monday, Tuesday following health episode at 9/11 memorial. — AP Politics (@AP_Politics) September 12, 2016

She was supposed to campaign in San Francisco and Los Angeles to start this week and tape an appearance for the “Ellen” show.

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Clinton has been ill with pneumonia, her doctor revealed in a Sunday evening statement.

Dr. Lisa R. Bardack released a statement via the campaign revealing the diagnosis on Sunday evening, hours after Clinton was seen stumbling on video after exiting a 9/11 memorial event early.

Bardack said Clinton had an examination at her home in Chappaqua, N.Y., after the incident, which was a result of dehydration and overheating.

She said the candidate is "re-hydrated and recovering nicely."