Senator John McCain from Arizona has a brain tumor, his office announced Wednesday night.

McCain, 80, was taken to a Phoenix hospital to have a blood clot removed from just above his eye last Friday, which forced him to miss votes on the Senate floor this week.

A pathology test came back and found a glioblastoma - a brain tumor - was associated with the clot. The senator and his family are looking at treatment options and are considering chemotherapy and radiation.

McCain has been in office since 1987 after serving in the House of Representatives for four years. He fought in the Vietnam War and is a former prisoner of war.

Cory Gardner, fellow Republican and Colorado's junior senator, released a statement saying he'll keep McCain in his thoughts. His full statement is below:

Not only is John McCain an American hero but he is also an amazing friend, father, husband, and son. I will be thinking of him every day as he fights this latest battle, and I look forward to seeing him soon in a place where he has done tremendous things for his country and his constituents - the United States Senate.

His office released this statement:

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. He is grateful to the doctors and staff at Mayo Clinic for their outstanding care, and is confident that any future treatment will be effective. Further consultations with Senator McCain's Mayo Clinic care team will indicate when he will return to the United States Senate.