Photos: 3rd Republican presidential debate

New Jersey Gov. Chris Christie speaks during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Sen. Marco Rubio, right, and fellow Floridian Jeb Bush argue a point during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Carly Fiorina speaks during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Ohio Gov. John Kasich speaks during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Republican presidential candidates appear during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Sen. Rand Paul of Kentucky, right, speaks as New Jersey Gov. Chris Christie looks on during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Dr. Ben Carson speaks during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Former Florida Gov. Jeb Bush, left, speaks as Sen. Marco Rubio looks on during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

New Jersey Gov. Chris Christie speaks during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Donald Trump speaks during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Sen. Ted Cruz of Texas is viewed on multiple televisions in the spin room at the Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Donald Trump makes a point as Dr. Ben Carson looks on during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Dr. Ben Carson watches as Donald Trump takes the stage during the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Republican presidential candidates take the stage for the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Carly Fiorina, from left, Sen. Ted Cruz, Gov. Chris Christie and Sen. Rand Paul take the stage at the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Donald Trump, from left, Dr. Ben Carson, Carly Fiorina, Sen. Ted Cruz, Gov. Chris Christie and Sen. Rand Paul take the stage for the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Donald Trump appears at the start of the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

Candidates take the stage for the CNBC Republican presidential debate at the University of Colorado at Boulder on Oct. 28, 2015.

A replica of presidential candidate Donald Trump is moved into place in the free-speech zone at the University of Colorado at Boulder before the CNBC Republican debate on Oct. 28, 2015.

Journalists work in the spin room at the University of Colorado at Boulder’s Coors Event Center before the third Republican presidential debate on Oct. 28, 2015.

The Coors Event Center at the University of Colorado at Boulder is the site of the third Republican presidential debate on Oct. 28, 2015.

Crews prepare the Coors Event Center at the University of Colorado at Boulder for the third Republican presidential debate on Oct. 28, 2015.