Senator John McCain, the Vietnam war hero turned senator and presidential candidate, has died aged 81.
Mr McCain died on Saturday surrounded by his family, a short statement released by his office said.
He was diagnosed with an aggressive brain tumour in July 2017 and had been undergoing medical treatment.
His family announced on Friday that Mr McCain, who left Washington in December, had decided to stop treatment.
Mr McCain's daughter Meghan said the task of her lifetime would now be "to live up to his example, his expectations, and his love.
"The days and years to come will not be the same without my dad – but they will be good days, filled with life and love, because of the example he lived for us," she wrote in a statement shared on Twitter.
The six-term senator and 2008 Republican presidential nominee was diagnosed after doctors discovered his tumour during surgery to remove a blood clot from above his left eye last July.
His family said he would lie in state in Phoenix, Arizona, and in Washington DC before a funeral at the Washington National Cathedral and his burial in Annapolis, Maryland.
The son and grandson of Navy admirals, Mr McCain was a fighter pilot during the war in Vietnam. When his plane was shot down, he spent more than five years as a prisoner of war.
While in the custody of his captors, he suffered torture that left him with lasting disabilities.
Tributes began to pour in for Mr McCain as soon as the news of his death was announced.
Former President George W Bush described Mr McCain as "a patriot of the highest order", adding: "He was a public servant in the finest traditions of our country. And to me, he was a friend whom I'll deeply miss."
Sarah Palin, who was Mr McCain's running mate during his 2008 bid for president, said the world had lost "an American original", sharing a picture of herself with the man she called her friend.
Donald Trump, whom Mr McCain has strongly criticised, tweeted his "deepest sympathies" to Mr McCain's family but made no comment about his life.
Tributes were also paid from the other side of the political spectrum.
Barack Obama, the Democrat who beat Mr McCain to the presidency, said despite their differences, they shared "a fidelity to something higher – the ideals for which generations of Americans and immigrants alike have fought, marched and sacrificed.
"Few of us have been tested the way John once was, or required to show the kind of courage that he did," Mr Obama said. "But all of us can aspire to the courage to put the greater good above our own.
"At John's best, he showed us what that means."
Former vice-president, long-time friend and political opponent Joe Biden said Mr McCain's "impact on America hasn't ended".
"John McCain's life is proof that some truths are timeless," he said in a statement. "Character. Courage. Integrity.
"A life lived embodying those truths casts a long, long shadow. John McCain will cast a long shadow."
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