WASHINGTON (Reuters) - U.S. Senator John McCain, a former prisoner of war in Vietnam who ran unsuccessfully for president as a self-styled maverick Republican in 2008 and became a prominent critic of President Donald Trump, died on Saturday, his office said. He was 81. McCain, a U.S. senator from Arizona for more than three decades, had been battling glioblastoma, an aggressive brain cancer, since July 2017 and had not been at the U.S. Capitol in 2018.
