McCain to begin radiation and chemotherapy

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McCain explains decision to vote against 'skinny' repeal

Republican ObamaCare repeal effort fails in the Senate

Sen. John McCain, recently diagnosed with an aggressive form of brain cancer, is returning to Arizona to begin radiation and chemotherapy.

In a statement Friday, his office said he will undergo further treatment at the Mayo Clinic in Phoenix while maintaining his work schedule. The senator, who won a sixth term last year, plans to return to Washington at the end of Congress' August recess.

The 80-year-old McCain had a blood clot removed about his left eye earlier this month and was diagnosed with glioblastoma, an aggressive type of brain cancer.

He returned to the Senate on Tuesday, casting a crucial vote to move ahead on health care legislation. Early Friday morning, he dashed GOP hopes on legislation by opposing a repeal measure.