GOP presidential front-runner Donald TrumpDonald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE on Tuesday reignited a feud with Fox News's Megyn Kelly, labeling the host a "lightweight" who is "highly overrated."

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Last month, Fox News Chairman and CEO Roger Ailes said "the air has been cleared" with Trump following a phone call, later issuing a statement supporting Kelly when the feud flared up. Fox also said that Kelly's vacation following the first GOP debate last month was pre-scheduled and unrelated to controversy with Trump.

Trump's latest comments come after the second GOP debate last week and an apparent uptick in attention for some rival candidates.

His remarks Tuesday also came after the businessman went off on Fox News on Monday evening, sharing a slew of messages on Twitter targeting another host, Bill O'Reilly.

Fox host Greta Van Susteren took to her blog following those tweets, telling Trump, "Give it a rest!"

Trump was scheduled to appear on O'Reilly's show, "The O'Reilly Factor," on Thursday evening, but tweeted Wednesday that he had been treated "very unfairly" and wouldn't appear on the network "for the foreseeable future."

Updated at 12:15 p.m.