Rick Santorum admitted his three-year-old daughter, Isabella, to the Children's Hospital of Philadelphia on Saturday, the campaign said in a statement.
Isabella was born with Trisomy 18, a rare genetic disorder. Most infants with this disorder don't live to see their first birthday.
The campaign has cancelled Santorum's Sunday morning Florida events, but said he will return to the Sunshine State as soon as possible.
Santorum has spoken on the campaign trail about his struggle with running for president while his daughter suffers from a serious illness.
"I don’t know whether her life is going to be measured — it’s always been measured — in days and weeks. Yet here I am," Santorum said in November. "Because I feel like I wouldn’t be a good dad if I wasn’t out here fighting for a country that would see the dignity in her and every other child."
In October, the former Pennsylvania senator's campaign posted this video introducing "Bella":
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