Arizona Sen. John McCain was diagnosed with a brain tumor, the Mayo Clinic Hospital in Phoenix announced on Wednesday.

The senator underwent surgery to remove a blood clot on Friday at Mayo Clinic Hospital in Phoenix. Lab results from that surgery confirmed the presence of brain cancer associated with the blood clot.

The Mayo Clinic said doctors diagnosed a tumor called a glioblastoma after surgery to remove a blood clot above McCain’s left eye last week.

"Subsequent tissue pathology revealed that a primary brain tumor known as a glioblastoma was associated with the blood clot," the hospital 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"

According to his office, McCain is "in good spirits as he continues to recover at home with his family in Arizona."

"Senator John McCain has always been a fighter," President Donald Trump said in a statement. "Melania and I send our thoughts and prayers to Senator McCain, Cindy and their entire family. Get well soon”. Barack Obama also took to twitter in moral support of McCain as he said,” John McCain is an American hero & one of the bravest fighters I've ever known. Cancer doesn't know what it's up against. Give it hell, John.”