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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.
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.

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    Trump, Cruz go to war with one week until Iowa

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Trump, Cruz go to war with one week until Iowa

CNN's Sara Murray reports from Iowa.

Trump, Cruz go to war with one week until Iowa

CNN's Sara Murray reports from Iowa.