Donald Trump Has Found the Perfect Insult for Jeb Bush

How to irk your introvert.

Republican presidential hopeful and former Florida Gov. Jeb Bush attends a town hall style meeting at La Progresiva Presbyterian School on September 1, 2015 in Miami, Florida.

Photo by Joe Raedle/Getty Images
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Republican presidential candidate Jeb Bush's introverted tendencies are well documented. So is front-runner Donald Trump's penchant for ruffling feathers. So when Trump repeatedly attacks Bush for being a “low-energy” person, it's bound to get ugly.

Even as Bush lashed back at Trump this week, with an attack video and a quiz showcasing Trump's more liberal past, the New York billionaire has continued to use his favorite dig.