Republican Presidential Debate in Simi Valley (38 images)

Republican presidential candidates, Dr. Ben Carson, businessman Donald Trump, Florida governor Jeb Bush and Wisconsin governor Scott Walker (L-R) square off during the second Republican presidential debate at the Reagan Library in Simi Valley, California on September 16, 2015. The 15 Republican candidates met in the second prime time debate for the 2016 presidential election. Photo by Max Whittaker/UPI/Pool

Republican presidential candidates, businesswoman Carly Fiorina (L) and Ohio governor John Kasich (L) square off during the second Republican presidential debate at the Reagan Library in Simi Valley, California on September 16, 2015. Photo by Max Whittaker/UPI/Pool

Republican presidential candidates, Texas U.S. Senator Ted Cruz (L) and Dr. Ben Carson square off during the second Republican presidential debate at the Reagan Library in Simi Valley, California on September 16, 2015. Photo by Max Whittaker/UPI/Pool

Republican presidential candidate, businessman Donald Trump answers a question during the second Republican presidential debate at the Reagan Library in Simi Valley, California on September, 16, 2015. Photo by Max Whittaker/UPI/Pool