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Meghan McCain, the McCains' 32-year-old daughter tweeted, \"The news of my father's illness has affected everyone one us in the McCain family.\"

Statement regarding my father @SenJohnMcCain: pic.twitter.com/SMte9Hkwkq

— Meghan McCain (@MeghanMcCain) July 20, 2017

ABC News' Mariam Khan and Dan Childs contributed to this report.

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