there's growing concern unfortunately about the health of senator john mccain. he's a warrior like none other in the senate but the 84-year-old war hero is getting increasingly frail from the brain cancer treatment he is undergoing. joining us is chief medical correspondent -- dana, are you ready? we have dana bash and sanjay gupta. he reviewed his medical records in 2008. this is dire stuff, sanjay. how are you going to explain it to people? >> we no back in july he went in for what they said was a routine check and at that time he had been feeling tired and had a