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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 battle for Iowa voters ahead of caucuses

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Trump, Cruz battle for Iowa voters ahead of caucuses

As Ted Cruz and Donald Trump stump in Iowa, speculation is rife about who Trump will announce as a key supporter for his bid for the White House this evening. CNN's Sara Murray reports.

Trump, Cruz battle for Iowa voters ahead of caucuses

As Ted Cruz and Donald Trump stump in Iowa, speculation is rife about who Trump will announce as a key supporter for his bid for the White House this evening. CNN's Sara Murray reports.