On the eve of his death, his family announced that he was ending his treatment.
The Suns also sent out their condolences to McCain's family along with a genuine message on how the organization feels about the late senator's contributions to the nation.
During his concession speech in Sedona, McCain would say, "We're Americans".
"Why don't we try the old way of legislating in the Senate, the way our rules and customs encourage us to act?"
The patent contempt the two men displayed for each other showed no sign of fading, even as McCain continued to weaken.
But in recent months, the man who had been a mainstay on Capitol Hill for more than three decades was noticeably absent.
Although the presidency would elude McCain twice - in 2000 and again in 2008 - he remained one of the most influential voices in the Senate, particularly in the area of foreign policy.
Derry's Shane Duffy gives verdict on his goal against Manchester United
Things haven't got any better! United could line him up for the end of the season and go with a stop-gap in the meantime. And that the Chilean will be back in roughly one to two weeks, however, they are yet to see the results of tests.
A statement issued the following day by the senator's office said he was at the Walter Reed National Military Medical Center in Maryland receiving treatment for the "normal side effects of his ongoing cancer therapy" and looked forward to returning to work as soon as possible.
Over the course of his career he rallied against pork-barrel spending and went against his own party's president, George W. Bush, on strategy for the Iraq war.
McCain came up short, but solidified his stature and eventually seized the Republican torch from the unpopular president Bush.
Some speculate that Cindy McCain could join their ranks. John McCain over the next couple of days. Both his father and grandfather were four-star admirals, with his father, John McCain Jr., advancing to commander in chief of Pacific forces during the Vietnam War. He graduates from the US Naval Academy in Annapolis, and becomes a fighter pilot.
"He frequently put partisanship aside to do what he thought was best for the country, and was never afraid to break the mould if it was the right thing to do".
His first brush with death came during the war in July 1967 when a missile fired accidentally on board the aircraft carrier, USS Forrestal, sparked a series of explosions and fires that killed 134 sailors.
Only three months later, on October 26, 1967, McCain's plane was shot down over North Vietnam. Fractures in both his arms and right leg are poorly treated, and McCain - whose father has risen to become commander of all USA forces in the Pacific, including Vietnam - is beaten and tortured throughout his detention.
McCain's death marks the end of an extraordinary life in which the son and grandson of two Navy admirals rose from the bottom of his class at the U.S. Naval Academy to almost winning the presidency.
His captors offered him early release after learning his father was a notable naval officer.
President Donald Trump, whom Mr McCain had strongly criticised, tweeted his "deepest sympathies" to Mr McCain's family but did not comment on his life. He was severely injured and taken prisoner. "I think go ahead criticize his politics, but you bring up that military service, you slam him as a vet, and I'll defend him as aggressively as I defend my own kids". Four years later he was elected to the Senate, and he was re-elected five times.
Barack Obama, who beat Mr McCain to the White House in 2008, said they shared a "fidelity to something higher". He spent much of his time as a prisoner of war in solitary confinement, aided by his faith and the friendships of his fellow POWs.