One of John McCain's final wishes, as he struggled against a devastating brain cancer, could not have been more clear: He made it known that he did not want Donald Trump to attend his funeral.
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The two men never pretended to like each other. It was not just their clashing personalities or vastly dissimilar backgrounds. Their differences were fundamental, their values dramatically at odds, and their disagreements public and pointed.
When Trump announced his candidacy for the Republican presidential nomination in June 2015, suggesting that many Mexican immigrants were criminals and "rapists," McCain (pictured) denounced him for using language that "fired up the crazies".
Trump's response: McCain was a "dummy" who had barely managed to graduate from the US Naval Academy.
Never one to give in, Trump attacked the former navy pilot over what might have seemed his least vulnerable point: the military career - including more than five years as a wounded and tortured prisoner of war in Vietnam - for which he received a slew of decorations including the Silver Star, the Legion of Merit and three Bronze Stars.
Trump, who received serial deferments and did not serve in the military, said that McCain was "a war hero (only) because he was captured," adding, "I like people that weren't captured." That comment drew widespread condemnation, including from several veterans groups.
McCain's response starkly illustrated the two men's different characters: The senator sought no apology on his own behalf but said that Trump did owe an apology "to the families of those who have sacrificed in conflict" and of those taken prisoner while "serving their country".
The rise of Trump's populist candidacy in 2016 was widely seen as a disavowal of McCain-style Republicanism and of the more establishment approach he took during his own presidential run in 2008.
Eight years later, here was a man who openly professed his love of money, who had avoided military service because of a foot problem he later said had healed itself, a man who bragged about greasing the wheels for his New York real estate empire by donating to both Democrats and Republicans.