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Republican presidential candidates Donald Trump, left, and Sen. Ted Cruz interact at the conclusion of the CNN Republican presidential debate at The Venetian Las Vegas on December 15, 2015.
Republican presidential candidates Donald Trump, left, and Sen. Ted Cruz interact at the conclusion of the CNN Republican presidential debate at The Venetian Las Vegas on December 15, 2015.

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    The Trump vs. Cruz battle for Iowa escalates

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The Trump vs. Cruz battle for Iowa escalates

With Sen. Ted Cruz leading in the Iowa polls, our 'Inside Politics' panel examines Donald Trump's strategy to keep Cruz on the defensive about his citizenship.

The Trump vs. Cruz battle for Iowa escalates

With Sen. Ted Cruz leading in the Iowa polls, our 'Inside Politics' panel examines Donald Trump's strategy to keep Cruz on the defensive about his citizenship.