MIAMI (AP) — 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.

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."