Republican presidential candidate Donald Trump met the press Tuesday in Iowa. Later in the day, he said he would not participate in the final debate before the Feb. 1 Iowa caucuses because of the involvement of Fox News anchor Megyn Kelly.
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The impact of a Trump no-show is tough to assess. Traditionally, candidates have to not only show up and campaign in the days before the Iowa caucus, but campaign vigorously to show how much they care about the voters.

Trump, though, has waged a highly unorthodox campaign, shunning much retail politicking, and still remains ahead in the polls. He was scheduled to be out of Iowa after the debate on Friday, and helping wounded warriors could neutralize his absence. He dismissed the effect, saying “I don’t think Iowans are going to care.”

Trump has been threatening all week to skip the debate. He remains angry at Kelly, who during the Republicans' August debate asked him about his derogatory comments about women. An annoyed Trump later said Kelly had had "blood coming out of her eyes, blood coming out of her wherever."

This week, he began criticizing her again, telling CNN Monday, "I don't like her." And, he added, he "might be the best thing that ever happened to her...Who ever even heard of her before the last debate?” Tuesday, he kept going, calling Kelly a "third-rate reporter."

Kelly is to moderate the Thursday debate in Des Moines, along with Bret Baier and Chris Wallace. She read Trump’s statement on her show Tuesday and interviewed former New York Mayor Rudy Guiliani, who said he believed Trump was making a mistake by skipping the debate.

Trump insisted he wasn’t afraid to spar with Kelly, saying he had done six debates and that “according to every single poll,” he had won every one of them. He noted that the Democrats were only holding six debates.

“The Republicans go on forever and ever and ever with debates,” he said. “It’s time that somebody plays grownup.” He said he arrived in Iowa on Tuesday with every intent to debate but was incensed by the Fox News statement. He called his decision “pretty irrevocable.”

“They can’t toy with me,” he said. “I said ‘Bye, bye.’ ”

Trump didn’t mention his intention to skip the debate at his town hall. But after the moderator noted that such events were better venues than debates for meeting candidates, Trump told the audience he doesn’t hold any grudges against Fox.

But he added, “They have to treat people fairly.”

Trump on Tuesday also picked up endorsements from Liberty University President Jerry Falwell Jr. and Joe Arpaio, the famously anti-immigration sheriff from Maricopa County, Ariz.

David Lightman contributed to this report from Washington.