Republican presidential candidate and Texas Senator Ted Cruz is daring Donald Trump to go through with this threat to due him for defamation.

<> on February 17, 2016 in Greenville, South Carolina.
Ted Cruz participates in a CNN South Carolina Republican Presidential Town Hall in Greenville, South Carolina. (Photo by Alex Wong/Getty Images)
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A Cruz TV ad shows Trump in a 1999 interview speaking in support of abortion rights.

Trump now says he opposes abortion.

Trump's attorney send Cruz a letter Tuesday charging the ad was "Replete with outright lies, false, defamatory and destructive statements."

At a CNN presidential forum Wednesday night, Cruz said to Trump, "Please Donald, file this lawsuit."

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