Fox News anchor Megyn Kelly waits to begin the Republican presidential candidate debate Thursday. Bloomberg/Bloomberg via Getty Images hide caption

Republican presidential candidate Donald Trump speaks as the crowd applauds during a campaign stop at the Radisson Hotel in Nashua, N.H., on Friday. John Minchillo/AP hide caption

Republican presidential candidates arrive Thursday for the final Republican presidential debate before the Iowa caucus in Des Moines, Iowa. Jim Watson/AFP/Getty Images hide caption

GOP presidential candidate Donald Trump will skip Thursday evening's Fox News debate amid a skirmish with the network over the inclusion of moderator Megyn Kelly. Rainier Ehrhardt/AP hide caption

Donald Trump waits to be introduced during a campaign event at the University of Iowa this week. With just days to go before the Iowa caucuses, Trump withdrew from the final GOP debate. Joe Raedle/Getty Images hide caption

Republican presidential candidate Donald Trump and Fox News Channel host and moderator Megyn Kelly during the first Republican presidential debate — the origin of their feud. John Minchillo/AP hide caption

Donald Trump and Fox News are at odds again, after the Republican presidential candidate criticized host Megyn Kelly. "Donald Trump rarely apologizes, although in this case, he should," Fox chief Roger Ailes said. Mark Wallheiser/Getty Images hide caption

Republican presidential candidates from left, Jim Gilmore, Lindsey Graham, Bobby Jindal, Rick Perry, Rick Santorum, Carly Fiorina, and George Pataki take the stage for a pre-debate forum at the Quicken Loans Arena, Thursday, Aug. 6, 2015, in Cleveland. Seven of the candidates have not qualified for the primetime debate. Andrew Harnik/AP hide caption

Republican presidential candidates, from left, Lindsey Graham, Ben Carson, John Kasich, Chris Christie, Bobby Jindal, Jeb Bush, Scott Walker and Rick Santorum speak among themselves after a forum Monday, Aug. 3, 2015, in Manchester, N.H. Jim Cole/AP hide caption

Rupert Murdoch (center) and his sons Lachlan (left) and James (right) are seen in a combination of file photos. Rupert Murdoch, the head of News Corp. and the Fox media empire, says he will hand over the reins of the company. Jason Reed/Reuters/Landov hide caption

Television personality Bill O'Reilly waits for the start of an event at the White House in February 2014. O'Reilly has for the past week fired back angrily at critics who have accused him of inflating his war-reporting record in a manner similar to suspended NBC Nightly News anchor Brian Williams. Pablo Martinez Monsivais/AP hide caption

Fox News Channel chief Roger Ailes attends a 2012 Hollywood Reporter celebration of "The 35 Most Powerful People in Media" in New York City. Stephen Lovekin/Getty Images hide caption