Trump and his campaign manager have slammed it as taunting and juvenile.

The stage is set for Thursday's Fox News Channel final debate ahead of the Iowa caucuses - but front-runner Donald Trump won't be there.

Cruz and Trump are neck-and-neck in Iowa polls and Cruz warned supporters Monday that a Trump victory won in Iowa he may be "unstoppable".

Here are the latest developments from the 2016 race for president, less than a week out from the Iowa caucuses. Ted Cruz are focusing their attacks on each other. His back and forth with the network reached a tipping point on Tuesday afternoon, when Fox News mocked Trump with a sarcastic statement that said the leaders of Iran and Russian Federation "both intend to treat Donald Trump unfairly when they meet with him if he becomes president".

According to Bloomberg News, Trump will host an event for the non-profit organization Wounded Warriors during the time slot of the debate.

Even Rep. Steve King, the conservative congressman barnstorming Iowa in support of Sen.

"I guess the jury is going to be out on whether it will help", King told CNN Tuesday night in a phone interview.

"What Fox wants to do is they want to have 24 million people tune in to watch Donald Trump so that their anchors can have the story about them", he said, pointing out that Trump could see it was a "bad deal" to appear at the debate.

In other Twitter posts, Mr Cruz likened Mr Trump's pulling out of the debate to a comical retreat from a Monty Python sketch, and accused Mr Trump of "trembling at being questioned" by Kelly.

The Trump campaign did not immediately respond to a request for comment regarding Cruz's invitation.

Trump's blunt-spoken candidacy has boosted ratings for the Republican presidential debates. "He took a lot of money out of there and didn't put a lot of money back in".

He called Fox executives "very dishonest" for accusing him of threatening Kelly in phone calls, and accused them of favoring other candidates because they had family members working for them. King said. "It's quite a possibility". Another time, the R.N.C. failed to prevent Trump from literally dictating the terms of a debate. But should he lose, he may never be able to break through as GOP voters look elsewhere for an anti-Trump candidate. People close to the campaign stress that its fundraising gives it several shots to take down Trump, especially in delegate-rich states that vote later in the calendar. "He's betting on him making a bigger splash", said Don Kass, chairman of Iowa's Plymouth County GOP, who predicted the decision to skip the debate would benefit the real estate mogul.

Despite the attention, there was little sense that Trump's move would significantly change the trajectory of the Republican contest on the ground in Iowa.

Cruz has repeatedly knocked Trump for saying he will skip the debate, challenging the billionaire businessman to a head-to-head debate on "The Mark Levin Show" earlier this week. "She's done multiple shows on why he shouldn't be even involved in the race on television".

"Not showing up is not being bold", he added. A former Mitt Romney advisor reportedly attempted to get Washington and NY donors to fund an eight-figure ad campaign past year critiquing Trump, only to be turned down due to donors' disinterest and a desire to maintain business relationships with the magnate, Politico reports. We're all-in in New Hampshire.

Lively and in-depth discussions of city news, politics, science, entertainment, the arts, and more.