Trump rules out third party run

Trump Casino, Las Vegas

One of the weapons the Republican Party establishment had against Donald Trump was challenging his loyalty to the GOP because he hadn't ruled out a run as an independent next year.

Well, that weapon is gone. Trump signed a pledge this afternoon that he will not mount a third party campaign for 2016.

The billionaire, who has never lacked confidence in himself, says he expects to be the Republican nominee for the next presidential election.