"My father completed first round radiation/chemo," Meghan tweeted Aug. 18. "His resilience & strength is incredible. Fight goes on, here's to small wins. #f***cancer"
Sen. McCain returned to Phoenix in late July to begin treatment at the Mayo Clinic for glioblastoma. His office said he would return to the nation's capitol following the August recess.
"In accordance with the guidance of his physicians, Senator McCain is returning to Arizona to undergo further treatment at Mayo Clinic," his office said in a statement released July 28. "On Monday, July 31, he will begin a standard post-surgical regimen of targeted radiation and chemotherapy. During that time, Senator McCain will maintain a work schedule. He plans to return to Washington at the conclusion of the August recess."