CNN sent out a video  that appears to be a rebuttal to President Donald Trump’s ‘fake news’ accusations against them and other liberal media networks. In it, CNN said that people may say an apple is a banana, and that their goal is to put facts first and clear up the facts and truths for their viewers.
— CNN (@CNN) October 23, 2017 
However, CNN has had a bunch of major mistakes over the years, which The Federalist  pointed out, regarding maintaining factual accuracy. Here’s one such example:
Before his dramatic congressional testimony, which many hoped would feature a smoking gun on Russian collusion or presidential abuse of power, CNN spent hours pushing a four-byline story that alleged James Comey would publicly dispute the president’s claim that the former FBI director told him on three occasions that he was not under investigation .
Comey did the opposite. Instead of withdrawing or correcting this story (even though they claimed to have made a “correction”), CNN inserted a paragraph maintaining that “Comey does not directly dispute that Trump was told multiple times he was not under investigation.” It is true that Comey did not directly dispute CNN by name, he just happened to unambiguously say the opposite of what CNN claimed he would.