On July 14, 2017, McCain underwent a minimally invasive craniotomy at Mayo Clinic Hospital in Phoenix, Arizona, in order to remove a blood clot above his left eye. His absence prompted Senate Majority Leader Mitch McConnell to delay a vote on the Better Care Reconciliation Act. Five days later, Mayo Clinic doctors announced that the laboratory results from the surgery confirmed the presence of a glioblastoma, which is a very aggressive cancerous brain tumor. Standard treatment options for this tumor include chemotherapy and radiation, although even with treatment, average survival time is approximately 14 months. McCain was a survivor of previous cancers, including melanoma.