Marco Rubio speaks during the CNN Republican presidential debate at The Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas, Nevada.
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Republican presidential candidates, from left, John Kasich, Carly Fiorina, Marco Rubio, Ben Carson, Donald Trump, Ted Cruz, Jeb Bush, Chris Christie and Rand Paul take the stage during the CNN Republican presidential debate at The Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas, Nevada.
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Jeb Bush speaks during the CNN Republican presidential debate at The Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas, Nevada.
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Donald Trump and Ted Cruz shake hands at the start of the CNN Republican presidential debate at The Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas, Nevada.
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Ben Carson speaks during the CNN Republican presidential debate at The Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas, Nevada.
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John Kasich speaks during the CNN Republican presidential debate at The Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas, Nevada.
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Republican presidential candidate Donald Trump walks onstage past CNN anchor Wolf Blitzer during the Republican presidential debate on December 15, 2015 in Las Vegas, Nevada.
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Rand Paul speaks during the CNN Republican presidential debate at The Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas, Nevada.
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Carly Fiorina responds to a question from debate moderator Wolf Blitzer during the CNN Republican presidential debate.
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Chris Christie speaks during the CNN Republican presidential debate at the Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas, Nevada.
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Chairman of the Republican National Committee Reince Priebus speaks before the main the CNN Republican presidential debate on December 15, 2015 in Las Vegas, Nevada.
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Rick Santorum is seen through the heads of audience members during the CNN Republican presidential debate.
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Mike Huckabee responds to debate moderator Wolf Blitzer during the CNN Republican presidential debate.
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Republican presidential candidate George Pataki speaks during the CNN Republican presidential debate on December 15, 2015 in Las Vegas, Nevada.
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Republican presidential candidate Rick Santorum speaks as South Carolina Sen. Lindsey Graham expresses frustration during the CNN Republican presidential debate.
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Republican presidential candidates George Pataki, Mike Huckabee, Rick Santorum and Lindsey Graham take the stage during the CNN Republican presidential debate at The Venetian Hotel & Casino.
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Republican presidential candidates George Pataki and Lindsey Graham shake hands before the CNN Republican presidential debate.
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CNN anchor Wolf Blitzer speaks before the first round of the CNN Republican presidential debate on December 15, 2015 in Las Vegas, Nevada.
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CNN reporter Dana Bash, second from right, prepares for the first round of the CNN Republican presidential debate.
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Republican presidential candidate Ben Carson speaks with members of the media before the start of the CNN Republican presidential debate.
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A member of the media walks past podiums on stage ahead of the Republican presidential candidate debate in Las Vegas, Nevada.
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The social media room is arranged for the Republican presidential debate, hosted by CNN, at The Venetian hotel in Las Vegas, Nevada, December 15, 2015. Participants on the main stage at the GOP debate include businessman Donald Trump, Texas Sen. Ted Cruz, retired neurosurgeon Ben Carson, Florida Sen. Marco Rubio, former Florida Gov. Jeb Bush, businesswoman Carly Fiorina, Ohio Gov. John Kasich, New Jersey Gov. Chris Christie, and Kentucky Sen. Rand Paul.
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A reporter addresses the camera as the stage is set for the fifth Republican presidential debate in Las Vegas, Nevada.
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Republican presidential candidate Ben Carson prepares for a television interview before the start of the CNN Republican presidential debate.
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Protestors carrying a likeness of Republican presidential candidate Donald Trump gather outside the Venetian Hotel & Casino before the CNN Republican presidential debate on Tuesday, Dec. 15, 2015, in Las Vegas.
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An image of Republican presidential candidate Ted Cruz appears on a marquee outside of the The Palazzo Las Vegas before the CNN Republican presidential debate at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada.
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An Elvis impersonator performs outside The Venetian Hotel & Casino before the CNN Republican presidential debate.
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