Home / Blogs / Senator John McCain diagnosed with brain tumor Senator John McCain diagnosed with brain tumor Dea. Ron Gray Sr. · Thursday, July 20th 2017 at 9:30PM · 380 views All In with Chris Hayes 7/19/17 Senator John McCain diagnosed with brain tumor The senator's office announced that McCain has been diagnosed with a brain tumor known as a glioblastoma. Duration: 4:07 About the Author Dea. Ron Gray Sr. Chicago, IL Posts Subscribe Profile Email Report