Sen. Marco Rubio, R-Fla., left, and Ben Carson have surged ahead of other GOP candidates, like former Florida Gov. Jeb Bush, to take center stage with Donald Trump at next week's GOP debate. Andrew Harnik/AP hide caption

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Rep. Paul Ryan told GOP lawmakers that he will run for speaker, but only if they embrace him by week's end as their consensus candidate, an ambitious bid to impose unity on a disordered and divided Republican conference. Andrew Harnik/AP hide caption

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Rep. Daniel Webster, R-Fla. leaves a House Republican special leadership election meeting on Capitol Hill in Washington on Thursday. House Speaker John Boehner, R-Ohio, is stepping down and retiring from Congress at the end of the month after nearly five years in the role. Andrew Harnik/AP hide caption

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Wisconsin Gov. Scott Walker speaks at a news conference Monday in Madison, Wis., where he announced that he is suspending his Republican presidential campaign. Morry Gash/AP hide caption

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Republican presidential candidate former Texas Gov. Rick Perry waves his arms while participating in the Fourth of July parade festivities in Amherst, N.H., Saturday, July 4, 2015. Cheryl Senter/AP hide caption

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Former Florida Gov. Jeb Bush, Dr. Ben Carson, New Jersey Gov. Chris Christie, former CEO Hewlett-Packard Carly Fiorina, U.S. Senator Lindsey Graham, Louisiana Gov. Bobby Jindal, Ohio Gov. John Kasich, former New York Gov. George Pataki, former Texas Gov. Rick Perry, former U.S. Senator Rick Santorum (PA), Wisconsin Gov. Scott Walker stand on the stage prior to the Voters First Presidential Forum. Darren McCollester/Getty Images hide caption

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Billionaire businessman Donald Trump has surged to the top of GOP presidential primary polls despite a slew of controversial comments since he launched his campaign in June. Scott Heppell/AP hide caption

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An honor guard from the South Carolina Highway Patrol lowers the Confederate battle flag, removing it from the Capitol grounds on July 10. John Bazemore/AP hide caption

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