Photos: Republican presidential debate

Republican presidential candidates arrive on stage for the a presidential debate on Aug. 6, 2015, at Quicken Loans Arena in Cleveland. From left are New Jersey Gov. Chris Christie; Florida Sen. Marco Rubio; retired neurosurgeon Ben Carson; Wisconsin Gov. Scott Walker; real estate magnate Donald Trump; former Florida Gov. Jeb Bush; former Arkansas Gov. Mike Huckabee; Texas Sen. Ted Cruz; Kentucky Sen. Rand Paul; and Ohio Gov. John Kasich.

Republican presidential candidate Donald Trump fields a question during the first prime-time presidential debate of the 2016 campaign on Aug. 6, 2015.

Republican presidential candidate Donald Trump talks to reporters in “Spin Alley” after the first prime-time presidential debate of the 2016 campaign season on Aug. 6, 2015.

Donald Trump speaks at the main Republican debate on Thursday. From left, Chris Christie, Marco Rubio, Ben Carson and Scott Walker look on.

Jeb Bush makes a point during the debate.

Candidates take their places for the prime-time debate.

Audience members are reflected in a window as Republican presidential candidates participate in the prime-time segment of the first debate of the 2016 campaign.

Donald Trump appears on a video screen above the crowd at Quicken Loans Arena in Cleveland.

Ten candidates chosen based on polling numbers participate in the main GOP presidential debate.

From left, Ted Cruz speaks with John Kasich and Jeb Bush talks with Rand Paul on the debate stage.

A large crowd fills the Cleveland arena for the prime-time debate.

Audience members cheer during the debate.

Ohio Gov. John Kasich, seated, greets the daughters of Texas Sen. Ted Cruz -- Caroline, 7, and Catherine, 4 -- during a commercial break.

Ben Carson, left, and Scott Walker share a laugh during the GOP candidates’ forum.

Sen. Rand Paul of Kentucky during the debate.

Ben Carson answers a question.

Ohio Gov. John Kasich gestures while making a point.

Texas Sen. Ted Cruz speaks as former Arkansas Gov. Mike Huckabee listens.

Donald Trump, positioned at center stage during the debate, responds to a question.

New Jersey Gov. Chris Christie greets the audience at the start of the main Republican debate.

From left, Chris Christie, Marco Rubio and Ben Carson take the stage before the 10-candidate debate.

Scott Walker, left, and Donald Trump arrive on stage for the start of the prime-time Republican presidential debate.

Before their debate, the candidates, from left, take the stage in Cleveland: Chris Christie, Marco Rubio, Ben Carson, Scott Walker, Donald Trump, Jeb Bush, Mike Huckabee, Ted Cruz, Rand Paul, and John Kasich.

The 10 candidates invited to the main GOP presidential debate arrive before the forum in Cleveland.

Debate moderators and Fox News anchors, from left, Chris Wallace, Megyn Kelly and Bret Baier.

The candidates at the preliminary GOP debate, from left: Jim Gilmore, Lindsey Graham, Bobby Jindal, Rick Perry, Rick Santorum, Carly Fiorina and George Pataki.

During the early debate, Lindsey Graham makes a point.

Audience seats are reserved for Donald Trump’s guests before the main GOP presidential primary debate in Cleveland.

From left, Jim Gilmore, Lindsey Graham, Bobby Jindal, Rick Perry, Rick Santorum, Carly Fiorina and George Pataki take the stage for the preliminary Republican debate.