On Wednesday evening, the office of Arizona Senator John McCain released a statement from the Mayo Clinic that McCain has been diagnosed with brain cancer.

"On Friday, July 14, Sen. John McCain underwent a procedure to remove a blood clot from above his left eye at Mayo Clinic Hospital in Phoenix. Subsequent tissue pathology revealed that a primary brain tumor known as a glioblastoma was associated with the blood clot," the statement said. "The Senator and his family are reviewing further treatment options with his Mayo Clinic care team. Treatment options may include a combination of chemotherapy and radiation."

The clinic's statement also said that McCain is recovering well from his surgery and that his underlying health is excellent.

McCain's office also sent a statement thanking people for their well-wishes and support.

Senator McCain appreciates the outpouring of support he has received over the last few days. He is in good spirits as he continues to recover at home with his family in Arizona.