Fox News host Tucker Carlson Tucker CarlsonJudge tosses Karen McDougal's defamation suit against Tucker Carlson OVERNIGHT ENERGY: House passes sweeping clean energy bill | Pebble Mine CEO resigns over secretly recorded comments about government officials | Corporations roll out climate goals amid growing pressure to deliver Former Florida attorney general calls Kyle Rittenhouse 'a little boy out there trying to protect his community' MORE said late Wednesday the 2017 GOP tax cut supported by the Koch brothers "was far better for corporate America than it was for the middle class."

"For years, the brothers have been the single most important funders of Republican politics in Washington, in the country" Carlson said during his opening monologue of his primetime program, adding that Charles and David Koch have been "remarkably effective in American politics."

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"But in the case of the Kochs, conservatives might want to pause and rethink the relationship," he later added. "As it turns out, the Kochs don’t have much in common with conservatives. They are totally opposed to most conservative policy goals. The Kochs are libertarian ideologues, passionate and inflexible."

After stating that the Kochs were at odds with the American people in pushing for cuts to Social Security and Medicare while opposing a bipartisan bill to lower drug prices, Carlson broached the tax cut signed into law by President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE in December 2017.

"Then the Kochs helped craft the 2017 tax cut, which was far better for corporate America than it was for the middle class," he said. "A majority of Republicans support capping interest rates on credit cards and payday loans. The Kochs think that’s ridiculous. Some years ago, when David Koch ran for vice president as a libertarian, abolishing all usury laws was part of his platform."

"There’s nothing surprising about any of this, or illegitimate. It’s what many rich liberals believe," Carlson added. "It’s just not what most Republicans think. And that’s a problem, given that the Kochs are the single most powerful figures in the Republican Party."

Trump has slammed the GOP mega-donors in the past, referring to them as "globalists" and a "total joke" within the GOP.

"The globalist Koch Brothers, who have become a total joke in real Republican circles, are against Strong Borders and Powerful Trade. I never sought their support because I don't need their money or bad ideas," Trump tweeted in July 2018. "They love my Tax & Regulation Cuts, Judicial picks & more."

The Koch brothers tied for eighth on Forbes' 2018 list of the wealthiest billionaires in the world with a net worth of more than $53 billion.

Charles Koch announced in June of last year that his brother David was stepping down from his roles at Koch Industries and its affiliated political groups due to health reasons.