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GREENVILLE, SC - FEBRUARY 13:  Republican presidential candidates (L-R) Ohio Governor John Kasich, Jeb Bush, Sen. Ted Cruz (R-TX), Donald Trump, Sen. Marco Rubio (R-FL) and Ben Carson stand on stage during a CBS News GOP Debate February 13, 2016 at the Peace Center in Greenville, South Carolina. Residents of South Carolina will vote for the Republican candidate at the primary on February 20.  (Photo by Spencer Platt/Getty Images)
GREENVILLE, SC - FEBRUARY 13:  Republican presidential candidates (L-R) Ohio Governor John Kasich, Jeb Bush, Sen. Ted Cruz (R-TX), Donald Trump, Sen. Marco Rubio (R-FL) and Ben Carson stand on stage during a CBS News GOP Debate February 13, 2016 at the Peace Center in Greenville, South Carolina. Residents of South Carolina will vote for the Republican candidate at the primary on February 20.  (Photo by Spencer Platt/Getty Images)

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    Trump, Cruz and Rubio in war of words before Primary

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Trump, Cruz and Rubio in war of words before Primary

Ahead of the South Carolina Republican primary, Ted Cruz has shrugged off Donald Trump's threats to sue Cruz, while Marco Rubio has continued to paint Cruz as a liar. CNN's Sunlen Serfaty reports.

Trump, Cruz and Rubio in war of words before Primary

Ahead of the South Carolina Republican primary, Ted Cruz has shrugged off Donald Trump's threats to sue Cruz, while Marco Rubio has continued to paint Cruz as a liar. CNN's Sunlen Serfaty reports.