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Trump has been threatening to "spill the beans" on Cruz's wife on social media, but has given no indication as to what his revelations are about. It is complete and utter lies, it is a tabloid smear. Polls often come out gauging Hillary Clinton's popularity relative to Donald Trump, or how Ted Cruz would fare against Bernie Sanders.

"I will not be intimidated", Carpenter said. "You probably know by now that most of the things Donald Trump says have no basis in reality".

The row over the National Enquirer story capped ab already nasty week in politics between Mr Cruz and Mr Trump.

"I won Louisiana and now I hear he's trying to steal delegates", Trump said, referring to Cruz. Stone tells USA Today that he had nothing to do with the article's placement, and he heard the Cruz allegations from "credible reporters".

Cruz has been in a war of words with Trump over tweets Trump had been sending.

"Our spouses and our children are off bounds", the Texas senator continued, saying he wasn't looking forward to explaining the attacks against their mother to his two young daughters.

Cruz also was angry at Trump for retweeting an unflattering image of his wife alongside a glamor photo of Melania Trump, telling reporters in Wisconsin on Thursday that his opponent was a "sniveling coward" and warning him to "leave Heidi the hell alone".

Bernie Sanders in Nevada

Ted Cruz blamed presidential rival Donald Trump on Friday for a tabloid story that aired rumors about Cruz's personal life.

"CNN has no reporting on what you're talking about, coming from the National Enquirer", network anchor Kate Bolduan made clear before letting Carpenter respond.

"The fact is that we still have about one in five Republican voters who are undecided about their prerference", he says.

In a February 1, 2016 file photo, Republican presidential candidate Donald Trump, accompanied by his wife Melania Trump, speaks during a campaign event in Cedar Rapids, Iowa.

On Tuesday, Trump inserted Cruz's wife, Heidi, into the race with a tweet that the Texas senator should "be careful" or he would "spill the beans on your wife".

Trump's threat came on Tuesday night when he was upset about an ad that showed his wife, former model Melania Trump, lounging nude with a caption saying, "Meet Melania Trump".