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 Republican presidential candidates (L-R) Sen. Marco Rubio (R-FL), Ben Carson, Donald Trump and Sen. Ted Cruz (R-TX), on stage during the CNN republican presidential debate at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada. Thirteen Republican presidential candidates are participating in the fifth set of Republican presidential debates.
 Republican presidential candidates (L-R) Sen. Marco Rubio (R-FL), Ben Carson, Donald Trump and Sen. Ted Cruz (R-TX), on stage during the CNN republican presidential debate at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada. Thirteen Republican presidential candidates are participating in the fifth set of Republican presidential debates.

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    Trump threatens to sue Ted Cruz

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Trump threatens to sue Ted Cruz

With insults flying between the Republican presidential candidates, CNN Correspondent Sunlen Serfaty previews the GOP debate this weekend.

Trump threatens to sue Ted Cruz

With insults flying between the Republican presidential candidates, CNN Correspondent Sunlen Serfaty previews the GOP debate this weekend.