The feud between Donald Trump and Jeb Bush appears to be intensifying.
Bush's 2016 presidential campaign has put out a video that shows Trump talking more like a Democrat than a Republican.
And while campaigning in Miami on Tuesday, Bush said Trump only resorts to insults because he can't talk about issues.
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As Bush put it, "If you're not totally in agreement with him, you're an idiot, you're stupid, you have low energy" and the like.
Trump tweeted in response: "Yet another weak hit by a candidate with a failing campaign."