Republican presidential candidate Donald Trump slammed U.S. Sen. Lindsey Graham, R-S.C., in Sun City Wednesday, calling his former rival "one of the dumbest human beings I've ever seen."
Trump was responding to Graham's appearance on Fox News earlier Wednesday, where Graham called Trump "a kook" and "unfit for office," adding would be "the most flawed nominee in the history of the Republican Party."
Trump hit back in Sun City, mocking Graham's demeanor, saying, "He couldn't even talk. He was shaking — the hatred. He went crazy. The guy is a nut job."
Graham appeared calm in the interview.
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Trump also mocked Graham's low level of support in polls before he dropped out of the GOP contest as well as his perspective on U.S. military engagement.
"I could push him over with a little thimble," says Trump, adding, "This guy knows nothing."
At Sun City in June, Trump read Graham's cell phone number out loud to the crowd — one of the first signs that his campaign was eager to break all the rules of political decorum.