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US Republican presidential candidate Donald Trump (R) is greeted on stage by fellow Republican candidate Ted Cruz before speaking at a rally organized by the Tea Party Patriots against the Iran nuclear deal in front of the Capitol in Washington, DC, on September 9, 2015.  AFP PHOTO/NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US Republican presidential candidate Donald Trump (R) is greeted on stage by fellow Republican candidate Ted Cruz before speaking at a rally organized by the Tea Party Patriots against the Iran nuclear deal in front of the Capitol in Washington, DC, on September 9, 2015.  AFP PHOTO/NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

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    Trump, Cruz & the GOP debates

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Trump, Cruz & the GOP debates

The 'Inside Politics' panel on Cruz's push for GOP debate moderators, why no one wants to take on Carson and Trump's softer tone.

Trump, Cruz & the GOP debates

The 'Inside Politics' panel on Cruz's push for GOP debate moderators, why no one wants to take on Carson and Trump's softer tone.