From Cleveland, Ohio

One thing that we have learned about Donald Trump in recent weeks is that criticism gets under his skin, as the GOP frontrunner used social media early Friday to repeatedly attack Fox News and the moderators of the first Republican debate, accusing the network of being biased against him.

Trump re-tweeted a string on messages from supporters where they attacked Kelly and the other Fox News moderators, as well as the network itself, which is usually seen as a reservoir of support for conservative candidates and causes.

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Credit: Jamie Dupree

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Credit: Jamie Dupree

Trump also found himself under fire from his comment at the outset of the first Republican debate, where the real estate mogul refused to guarantee that he would support the eventual GOP nominee - if he doesn't win the nomination.

"I think that should be of note and importance to Republican voters," said former Congressman Lincoln Diaz-Balart of Florida, a supporter of Jeb Bush.

Trump's refusal to stand with the GOP nominee drew the loudest response from Sen. Rand Paul (R-KY), who accused Trump of trying to "buy politicians of all stripes."

"He's already hedging his bets because he's used to buying politicians," Paul added.