Arizona Sen. John McCain is being treated for brain cancer, according to a statement from his office.

“Sen. John McCain underwent a procedure to remove a blood clot from above his left eye… Subsequent tissue pathology revealed that a primary brain tumor known as glioblastoma was associated with the blood clot,” the statement said.

The senator had the procedure last Friday at the Mayo Clinic Hospital in Phoenix.

“The senator and his family are reviewing further treatment options with this Mayo Clinic care team,” the statement continued. “Treatment options may include a combination of chemotherapy and radiation.”

McCain’s daughter Meghan McCain also released a statement on Twitter.

“The news of my father’s illness has affected every one of us in the McCain family. My grandmother, mother, brothers, sister and I have all endured the shock of the news and now we must live with the anxiety about what comes next,” she said.

Doctors say McCain is recovering from his surgery amazingly well and his underlying health is excellent, according to the statement.

McCain was the GOP's presidential nominee in 2008. A Navy pilot, he was shot down over Vietnam and held as a prisoner for 5 ½ years.