John McCain diagnosed with brain cancer© Provided by The Hill John McCain diagnosed with brain cancer Sen. John McCain (R-Ariz.) has been diagnosed with brain cancer, the Mayo Clinic Hospital in Phoenix said Wednesday.The tumor was discovered after the senior Arizona senator underwent a minor procedure last week to remove a blood clot from above his left eye.”Subsequent tissue pathology revealed that a primary brain tumor known as a glioblastoma was associated with the blood clot,” the hospital said in a statement.

“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.”