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Like his father and grandfather, McCain had a distinguished career in the Navy.
Both his dad and grandfather eventually became 4 star admirals, and John acquired a lot of "street cred" due to the fact that he was a prisoner of war for 6 years in Hanoi during the Vietnam War.
Not everyone who has served in the military, though, agree with McCain's hawkish positions.
36 retired U.S. Generals recently wrote a letter to the Washington Post supporting the Iran treaty deal.
Their letter, and the agreement itself, are far more rational than what many Republicans (including McCain) propose.
Few people, though, are as nutty as Presidential candidate Mike Huckabee, who said this about the treaty:
Presidential candidate Mike Huckabee called the Iran deal “idiotic,” and likened it to events of the Holocaust, saying that President Obama will ultimately “take the Israelis and march them to the door of the oven.”
But the truly crazy person in the Senate, Ted Cruz (also a Presidential candidate) , is of the opinion that the treaty deal "will lead to the murder of millions of Americans by radical theocratic zealots":