WASHINGTON — Senator John McCain of Arizona, who has been battling brain cancer for more than a year, will no longer be treated for his condition, his family announced on Friday, a sign that the Republican war hero is most likely entering his final days. “Last summer, Senator John McCain shared with Americans the news our family already knew: He had been diagnosed with an aggressive glioblastoma, and the prognosis was serious. In the year since, John has surpassed expectations for his survival. But the progress of disease and the inexorable advance of age render their verdict,” the family said...