Watch: Donald Trump And Jeb Bush Butt Heads at the GOP Debate

CNN hosted the last GOP debate of 2015, which also happens to be the last debate between two dozen different candidates, at the Venetian Hotel in Las Vegas, Nevada.

While the GOP candidates were supposed to be discussing foreign policy, the the war of words between frontrunner Donald Bush and hopeful nominee Jeb Bush may have stolen the show.

At one point, Trump mocked Jeb Bush as a "tough guy", while Jeb Bush declared Donald Trump "cannot insult his way to the presidency."