The 5th Republican debate in Las Vegas (29 images)
The fifth Republican presidential candidates' debate at the Venetian Hotel & Casino in Las Vegas, Nevada on December 15, 2015.
Donald Trump (L) and Ted Cruz participate in the fifth Republican presidential candidates' debate at the Venetian Hotel & Casino in Las Vegas, Nevada on December 15, 2015. Pool Photo by Ruth Fremson/UPI
Jeb Bush and Chris Christie participate in the fifth Republican presidential candidates' debate at the Venetian Hotel & Casino in Las Vegas, Nevada on December 15, 2015. Pool Photo by Ruth Fremson/UPI
John Kasich (L) and Carly Fiorina participate in the fifth Republican presidential candidates' debate at the Venetian Hotel & Casino in Las Vegas, Nevada on December 15, 2015. Pool Photo by Ruth Fremson/UPI
(L-R) Marco Rubio, Ben Carson and Donald Trump participate the fifth Republican presidential candidates' debate at the Venetian Hotel & Casino in Las Vegas, Nevada on December 15, 2015. Pool Photo by: Ruth Fremson/UPI