Tucker Carlson was ruled to be not a credible news source in a court of law when he was sued for slander. US District Judge Mary Kay Vyskocil agreed with Fox's

Tucker Carlson was ruled to be not a credible news source in a court of law when he was sued for slander. US District Judge Mary Kay Vyskocil agreed with Fox's premise, adding that the network "persuasively argues" that "given Mr. Carlson's reputation, any reasonable viewer 'arrive[s] with an appropriate amount of skepticism' about the statements he makes." https://www.businessinsider.com/fox-news-karen-mcdougal-case-tucker-carlson-2020-9 https://www.businessinsider.com/fox-news-karen-mcdougal-case... It's the "any reasonable viewer arrives with an appropriate amount of skepticism" part that seems to be the problem.