The Untold Story with Martha MacCallum - Stuart Varney's Final Preparations Before The Second Republican Debate

Host of Varney & Co. on FOX Business and moderator of the 2nd Republican Primary Debate, Stuart Varney joins Martha to discuss his preparations for the event, how he plans on keeping the candidates in check, and the keys to moderating a debate., Stuart Varney shares with Martha how he's preparing and plans to moderate the 2nd Republican Primary Debate on FOX Business.