Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Thursday accused CNN of bias, even after reports hours earlier that the network hired his former campaign manager, Corey Lewandowski, as a political commentator.

"CNN, which is totally biased in favor of Clinton, should apologize. They knew they were wrong," the presumptive GOP presidential nominee tweeted Thursday, linking to a report that claims CNN lied about Trump's characterization of presumptive Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE's immigration policies.

In another tweet, he accused the news network of lying to make Clinton look better.

"Here is another CNN lie. The Clinton News Network is losing all credibility. I'm not watching it much anymore," Trump wrote.

CNN, which is totally biased in favor of Clinton, should apologize. They knew they were wrong. https://t.co/KR7OnS8h6s — Donald J. Trump (@realDonaldTrump) June 23, 2016

Here is another CNN lie. The Clinton News Network is losing all credibility. I’m not watching it much anymore. https://t.co/pNSgSjD5gW — Donald J. Trump (@realDonaldTrump) June 23, 2016

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Lewandowski, who was fired from the Trump campaign Monday, will work for CNN in a salaried position and be exclusive to the network, according to reports Thursday.

Trump frequently blasts the network on Twitter. In June alone, Trump sent out six tweets accusing it of unfair treatment.

In a tweet from earlier this month, he accused CNN of distorting his words while praising Fox News for treating him fairly.

I am watching @FoxNews and how fairly they are treating me and my words, and @CNN, and the total distortion of my words and what I am saying — Donald J. Trump (@realDonaldTrump) June 13, 2016

Earlier in June, Trump called CNN's news shows "predictable garbage."

I am watching @CNN very little lately because they are so biased against me. Shows are predictable garbage! CNN and MSM is one big lie! — Donald J. Trump (@realDonaldTrump) June 5, 2016

Trump has also feuded with other cable news networks throughout his campaign.

Trump and Fox News anchor Megyn Kelly had a tumultuous relationship after she questioned him about his treatment of women at a debate last summer. He called her "overrated" and "crazy" and made an apparent reference to her menstrual cycle, and he skipped a Fox News debate a week before the Iowa caucuses. But the feud died down after she hosted him in a prime-time special last month.

Trump has also repeatedly gone after MSNBC host Joe Scarborough after he called the presumptive Republican nominee a "rank amateur" and criticized his aggressiveness.