CNN And Facebook Host The Republican Presidential Primary Debate In Las Vegas [Getty Images]

Senator Lindsey Graham, a Republican from South Carolina and 2016 Republican presidential candidate, applauds on stage at the start of the Republican presidential candidate debate at The Venetian in Las Vegas, Nevada, U.S., on Tuesday, Dec. 15, 2015. With less than two months remaining before the Feb. 1 Iowa caucuses and the Feb. 9 New Hampshire primary, middle-of-the-pack candidates hoping for a late surge in the polls have little choice but to come out swinging in tonight's fifth Republican debate. Photographer: Patrick T. Fallon/Bloomberg via Getty Images

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