Senator John McCain has been diagnosed with a brain tumour.
http://edition.cnn.com/2017/07/19/health/gupta-mccain-glioblastoma/index.html
The tumour was discovered when the 80 yr. old Republican Senator from Arizona underwent a minimally invasive surgical procedure to remove a blood clot over his left eye that was detected by an MRI scan following a routine health screening.
According to CNN Chief Medical Correspondent, Dr. Sanjay Gupta who spoke with permission to McCain's doctors, the tumour is a primary glioblastoma. This is the same type of tumour that killed Senator Edward Kennedy in 2009.