Republican presidential candidates stand on stage before the main debate Wednesday, September 16, at the Reagan Presidential Library in Simi Valley, California. From left to right are U.S. Sen. Rand Paul, former Arkansas Gov. Mike Huckabee, U.S. Sen. Marco Rubio, U.S. Sen. Ted Cruz, retired neurosurgeon Ben Carson, businessman Donald Trump, former Florida Gov. Jeb Bush, Wisconsin Gov. Scott Walker, businesswoman Carly Fiorina, Ohio Gov. John Kasich and New Jersey Gov. Chris Christie.
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Trump clashes with Walker early in the debate.
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Christie makes a point.
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Rubio looks on as Huckabee speaks.
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Carson responds to a question.
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Walker watches Fiorina answer a question.
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Trump, the front-runner in the polls, was on the attack early in the debate.
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Christie delivers an answer as Kasich looks on.
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Fiorina was appearing in the main GOP debate for the first time. Last month she was in the second-tier debate with the lowest-polling candidates.
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Cruz speaks during the debate.
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Paul and Huckabee participate in the debate.
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Rubio attends pre-debate preparations.
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Walker before the debate.
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Bush poses with CNN-labeled water in the hours before the event.
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Carson answers reporters' questions before the debate.
