Analysis: Warrior faces a new battle
By James Cook, BBC North America correspondent
John McCain is known in Washington as a tough, independent-minded senator – a warrior who is now facing another battle against cancer.
He earned his reputation the hard way, being shot down as a US Navy pilot over Vietnam where he was held as a prisoner of war for more than five years, including two in solitary confinement.
Repeatedly beaten and tortured, Mr McCain was never again able to raise his arms above his head.
During the most recent presidential election campaign, Donald Trump belittled the senator as “not a war hero” saying “I like people who weren’t captured”.
Many Americans were horrified.
Mr McCain may have annoyed many Republicans by arguing for reforms to campaign finance and immigration laws.
He may have irritated opponents of America’s many wars with his forceful arguments in favour of the projection of US military might.
But this country reveres its veterans. The attacks on John McCain’s personal sacrifice were roundly condemned then – and millions of Americans will be praying for his recovery now.