GOP unites against Trump, Carson threatens third party run

WASHINGTON (MEDIA GENERAL) – The remaining Republican presidential candidates will gather on Tuesday for their final debate of 2015 and are expected to sharpen their attacks against front-runner Donald Trump.
The CNN debate, hosted in Las Vegas, will be the first time the GOP hopefuls have gathered together since the Dec. 2 terror attack in San Bernardino, California.
Since the attack, several candidates have shifted their focus to security issues and have gone on the record abou