Early ratings: Fox News Channel debate second lowest for GOP this cycle

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How Did Donald Trump Do Vs. Fox News GOP Debate?

The first Republican presidential debate of the season without front-runner Donald Trump generated smaller viewer interest than all but one of this cycle's prior GOP gatherings, according to preliminary Nielsen estimates.

In the metered-market overnights, which represent 56 of the nation's largest markets, Fox News Channel's debate from Iowa averaged an 8.4 household rating. This is up vs. the 7.4 overnight rating for the most recent GOP debate, on Fox Business Network earlier this month, but it stands as the second lowest-rated of the six Republican gatherings this cycle.

SEE ALSO: Trump skips debate, wins on social media

Nielsen will issue total-viewer estimates later today, but it's likely that last night's debate on FNC averaged in the vicinity of 12 million viewers. By comparison, the combined viewership of CNN and MSNBC, which covered Trump's competing Iowa event last night, appears to be about 3 million or so.

Curiosity over the unpredictable Trump fueled record tune-in for the first GOP debate last summer, as Fox News Channel drew 24 million in August — the largest ever audience for a non-sports cable program — and CNN followed that up a month later with a little over 23 million. Ratings dipped for the subsequent four debates (ranging between 11.1 million and 18.2 million), though they remained higher than in years past.

The Democratic debates have rated lower, but at least some of this is due to three of them being scheduled in lower-profile timeslots on the weekend. The peak viewership came on a Tuesday last October, when CNN drew 15.8 million viewers.

Trump on Tuesday announced that he would not attend Thursday's debate over his objections to Fox News Channel's anchor and debate moderator Megyn Kelly. "Megyn Kelly's really biased against me," he said in an Instagram video that day. "She knows that. I know that. Everybody knows that. Do you really think she can be fair at a debate?"

See photos from Donald Trump's Iowa rally

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Donald Trump's Iowa Rally at the same time as GOP debate
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Early ratings: Fox News Channel debate second lowest for GOP this cycle
Donald Trump speaks during a campaign rally raising funds for US military veterans at Drake University in Des Moines, Iowa on January 28, 2016. US Republicans scrambling to win the first contest in the presidential nomination race were gearing for battle at high-profile debate in Iowa, but frontrunner Donald Trump is upending the campaign by defiantly refusing to attend. Trump's gamble has left the presidential race in uncharted waters just days before Iowans vote on February 1, insisting he will not back down in his feud with debate host Fox News.Instead, the billionaire has doubled down, hosting a rogue, rival event for US military veterans at the same time that his own party is showcasing its candidates for president to all-important Iowa voters. / AFP / William EDWARDS (Photo credit should read WILLIAM EDWARDS/AFP/Getty Images)
Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, waves during a campaign event in Des Moines, Iowa, U.S., on Thursday, Jan. 28, 2016. Trump, according to a flurry of early-state and national polls, is the overwhelming favorite of self-identified moderate and liberal Republican voters. Among more conservative voters, he often trails his chief rival for the nomination, U.S. Senator Ted Cruz. Photographer: T.J. Kirkpatrick/Bloomberg via Getty Images
Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, speaks during a campaign event in Des Moines, Iowa, U.S., on Thursday, Jan. 28, 2016. Trump, according to a flurry of early-state and national polls, is the overwhelming favorite of self-identified moderate and liberal Republican voters. Among more conservative voters, he often trails his chief rival for the nomination, U.S. Senator Ted Cruz. Photographer: T.J. Kirkpatrick/Bloomberg via Getty Images
Protesters, left, are confronted by supporters during a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, in Des Moines, Iowa, U.S., on Thursday, Jan. 28, 2016. Trump, according to a flurry of early-state and national polls, is the overwhelming favorite of self-identified moderate and liberal Republican voters. Among more conservative voters, he often trails his chief rival for the nomination, U.S. Senator Ted Cruz. Photographer: T.J. Kirkpatrick/Bloomberg via Getty Images
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He then appeared on Wednesday's edition of "The O'Reilly Factor," helping boost the show to a two-month high of 3.8 million viewers. Host Bill O'Reilly tried to persuade Trump to reconsider and attend the debate. "You are depriving people of seeing you in a forum they want to see you in," O'Reilly said to Trump before asking him point blank if he'd reconsider. "You and I had an agreement that you would not ask me that," responded Trump.

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