McCain's death comes just one day after we learned the senator and former Republican presidential nominee made a decision to stop medical treatment for brain cancer. "In the thirty three years we shared together, he raised me, taught me, corrected me, comforted me, encouraged me and supported me in all things", Meghan McCain wrote.
President Donald Trump, who once mocked McCain's war record, said he sent his "deepest sympathies and respect". "With the senator when he passed were his wife Cindy and their family", his office said in a statement.
Afterward, McCain spent much of his time in Arizona undergoing treatment and resting. As a leader of the Armed Services and Foreign Relations committees, he was at the forefront of a group of senators who saw Putin's Russian Federation as a growing threat to America.
A vanquished McCain shakes hands with Republican presidential nominee George W Bush at the conclusion of the Republican National Convention in Philadelphia, on August 3, 2000.
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Ex-president Barack Obama, the Democrat to whom McCain lost the presidency in the 2008 elections, said "we are all in his debt".
"I am lucky to count myself among those privileged enough to have known him".
Glioblastoma, an aggressive form of brain cancer, also claimed the life of former senator Ted Kennedy.
Sen. John McCain has died at the age of 81. He was elected to the U.S. House of Representatives in 1982 and won the first of six Senate terms in 1986. He was preparing for a bombing run in 1967 when a missile inadvertently fired from another plane hit his fuel tanks, triggering a fatal explosion and fire.
Trump was furious about McCain's vote and frequently referred to it at rallies, but without mentioning McCain by name. Roger and I send our honest condolences and love to his dedicated wife Cindy and their seven children. Trump retorted that McCain was "not a war hero", adding: "I like people who weren't captured".
Ohio Senator Sherrod Brown released a statement Saturday night saying, "John McCain was an American hero who embodied our nation's most cherished values: service and sacrifice". State law does not require that an election for a vacant Senate seat take place this year, says Eric Spencer, director of election services for the Arizona Secretary of State. He was a public servant in the finest traditions of our country. McCain was held in a prison camp where he said he was beaten every 2 or 3 hours by guards over the course of several days.