Doctors say Arizona Sen. John McCain has a brain tumor associated with a blood clot that was removed last week.
In a statement late Wednesday, doctors reveal that McCain has been diagnosed with glioblastoma, an aggressive cancer. The statement says the 80-year-old senator and his family are reviewing further treatment, including a combination of chemotherapy and radiation.
The senator has been recovering at his Arizona home after doctors at the Mayo Clinic removed a blood clot above his left eye.
The 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 1/2 years.
Gov. Larry Hogan released a statement on Facebook, wishing McCain a "full and speedy recovery."
Read Hogan's statement below:
"The First Lady and I are sending our heartfelt thoughts and prayers to my friend Senator John McCain and his family as he recovers from his surgery. As a cancer survivor, I know how difficult it can be to receive that first diagnosis, but I know that Senator McCain will fight this battle with the same courage and strength that he has shown throughout his lifelong commitment to public service and selfless dedication to our nation. We are wishing him a full and speedy recovery - cancer just picked the wrong guy to mess with!"
ABC2 News contributed to this report.