That's probably true. For every person who believes CNN is fake news how many believe Fox is fake news? MSNBC vs. OAN? New York Times vs. New York Post? Add them all together and it's probably a majority.
All Trump can do abut it is plant the seed by inventing catchy phrases like ‘fake news.’ Hard lefties will hate him even more but those that we have some hope for will at least see the truth in what he’s saying. Peel a few off just like he’s doing with blacks.