Photos: Republican presidential debate

Republican presidential candidates Ben Carson, left, and Donald Trump at the GOP debate Sept. 16, 2015.

Republican presidential candidate Sen. Marco Rubio at the GOP debate Sept. 16, 2015.

New Jersey Gov. Chris Christie at the Republican presidential debate Sept. 16, 2015.

Republican presidential candidates former Arkansas Gov. Mike Huckabee, left, and Marco Rubio during the debate on CNN on Sept. 16, 2015.

Presidential candidates Sen. Marco Rubio, from left, Sen. Ted Cruz and Ben Carson during the GOP debate at the Reagan Presidential Library in Simi Valley, Calif., on Sept. 16, 2015.

Kentucky Sen. Rand Paul at the Republican presidential debate Sept. 16, 2015.

Businesswoman Carly Fiorina was among the 11 Republican presidential candidates at the debate Sept. 16, 2015.

Republican presidential candidate and retired neurosurgeon Ben Carson at the debate Sept. 16, 2015.

Republican presidential candidate and former Arkansas Gov. Mike Huckabee, left, speaks while U.S. Sen. Marco Rubio listens during the debate Sept. 16, 2015.

Republican candidates Wisconsin Gov. Scott Walker and Carly Fiorina at the Sept. 16, 2015, debate in Simi Valley, Calif.

Former Florida Gov. Jeb Bush, right, and Donald Trump try to get a few words in at the CNN Republican presidential debate Sept. 16, 2015.

Republican presidential candidates Wisconsin Gov. Scott Walker and Carly Fiorina on stage at the debate Sept. 16, 2015.

Donald Trump speaks during the Republican presidential debate Sept. 16, 2015.

Republican presidential candidates prior to the second GOP debate at the Reagan Presidential Library on Sept. 16, 2015, in Simi Valley, Calif.

Republican presidential candidates Donald Trump, left, and former Florida Gov. Jeb Bush talk before the debate Sept. 16, 2015.