John McCain, the longtime senator and 2008 GOP presidential candidate who refused to leave fellow prisoners of war behind to escape years of torture in Vietnam, and whose maverick streak as Arizona’s senior statesman at times frustrated fellow Republicans and confounded President Donald Trump, has died, his family confirmed in a statement Saturday. He was 81and had been diagnosed with brain cancer in July 2017. McCain had decided to discontinue medical treatment for the glioblastoma, an aggressive form of brain cancer, his family announced on Aug. 24. He had surpassed expectations for his survival, but "the progress of disease and...