dr. sanjay gupta spoke excleesively with john mccain's doctors. >> with senator mccain's permission, i was able to talk to his doctors at the mayo clinic and got a better idea of what's transpired with his care. he had an operation this past friday to remove a blod collection within his brain just above his left eye. we now know that it blood collection was caused by a type of brain tumor known as a glee yo blas toe ma. this is a tumor that's quite aggressive and will require further treatment. a form of chemo and radiation. we know the senator had been feeling fatigued for the last several months and complained about a bout of double vision. that's what caused his doctors to get the scan of his brain in the first place. just over the last day now, they have found this information out about what caused this bleeding again. discussions now taking place between senator mccain and his