John McCainJohn Sidney McCainMeghan McCain: Harris 'sounded like a moron' discussing immigration Arizona AG Mark Brnovich launches Senate challenge to Mark Kelly Arizona Democrats launch voter outreach effort ahead of key Senate race MORE, the GOP's 2008 presidential nominee, said Sunday that Donald TrumpDonald TrumpBiden prepares to confront Putin Biden aims to bolster troubled Turkey ties in first Erdoğan meeting Senate investigation of insurrection falls short MORE could be a capable president, but that the billionaire needs to "heal many of the wounds" he opened during his tumultuous campaign. 

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"I think it's obvious there has to be outreach on his part to heal many of the wounds," the Arizona senator said on CNN's "State of the Union." "Frankly, I have never seen ... a campaign like this one, where people's integrity and character are questioned.

"That bothers me a lot. It bothers me a lot because you can violently disagree with someone on an issue, but to attack their character and integrity, those wounds take a long time to heal." 

One group that needs an apology, McCain said, are prisoners of war. 

Trump, the presumptive Republican presidential nominee, sparked criticism when he mocked McCain's military service last summer, saying, "I like people who weren't captured." 

"There's a body of American heroes who would like to see him retract that statement," McCain said.