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NORTH CHARLESTON, SC - JANUARY 14:  Republican presidential candidates (L-R) Donald Trump and Sen. Ted Cruz (R-TX) participate in the Fox Business Network Republican presidential debate at the North Charleston Coliseum and Performing Arts Center on January 14, 2016 in North Charleston, South Carolina. The sixth Republican debate is held in two parts, one main debate for the top seven candidates, and another for three other candidates lower in the current polls.  (Photo by Scott Olson/Getty Images)
NORTH CHARLESTON, SC - JANUARY 14:  Republican presidential candidates (L-R) Donald Trump and Sen. Ted Cruz (R-TX) participate in the Fox Business Network Republican presidential debate at the North Charleston Coliseum and Performing Arts Center on January 14, 2016 in North Charleston, South Carolina. The sixth Republican debate is held in two parts, one main debate for the top seven candidates, and another for three other candidates lower in the current polls.  (Photo by Scott Olson/Getty Images)

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Trump to Cruz: You're a liability as a candidate

Speaking at the FOX Business GOP debate, Ted Cruz and Donald Trump spar over the issue of Cruz's eligibility for president because of his birthplace.

Trump to Cruz: You're a liability as a candidate

Speaking at the FOX Business GOP debate, Ted Cruz and Donald Trump spar over the issue of Cruz's eligibility for president because of his birthplace.