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With Scott Walker’s decision to end his presidential campaign dominating the headlines, Donald Trump tried to get the attention back on himself Monday night by restarting his war with Fox News only an hour after appearing on the cable news channel.

On Twitter, Trump called out Fox News host Bill O'Reilly for treating him just as "unfairly" on The O’Reilly Factor as he claimed the TODAY Show did earlier that day, angry because O'Reilly didn't use the polls he felt were more favorable to him.

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It all came to a crescendo when Trump, apparently dissatisfied with analyst Rich Lowry's critique that Trump was all "great plans" no substance, tweeted this:

I am having a really hard time watching @FoxNews. — Donald J. Trump (@realDonaldTrump) September 22, 2015

Afterwards he set off on a retweeting frenzy, reposting 12 comments from angry supporters defending him.

Throughout his campaign, Trump has used Twitter as a way to insert himself into the news cycle. He has gotten into spats with both the media, most notably with Fox News host Megyn Kelly, and his rival 2016 candidates.

“He wants people to like him. When people criticize him, he takes it personally. And then, you know, this machine, this tweeting thing, that’s like the worst thing you could give Donald Trump is this tweeting thing," O'Reilly told Matt Lauer on TODAY. "So I just think this is just an extension of his reality show.”

Despite the confident front, the drop in some polls seems to be impacting the campaign - however slightly. In the lead up to the second GOP debate, Trump uncharacteristically declined two opportunities to speak to the media in Dallas and on the deck of the USS Iowa.

The campaign said Trump was beefing up on foreign policy - but some critics said his debate performance showed a clear lack of detail and depth in his understanding of the topic. In fact, GOP sources told NBC News in the days before the Reagan Library debate that Trump's team appeared "nervous" in a way not seen since he entered the race.