He didn't expose anything. If you couldn't see that fox is conservative, you're blind or CNN is hard left, you're blind. That's not exposing, that's pointing out something that was out in the open for the dumb people in the back.
Trump is now saying that CNN should turn conservative because Fox won't push 2000 mules. He's literally turned on every news station that doesn't push his agenda. If they don't do what he wants, he turns and they become the "fake news".
He's running out of networks. He'll have Newsmax (am i spelling it correctly) and OANN on the right that I believe he still thinks is on his side. If he's elected, it'll get really interesting because neither i believe are on major streaming services to my knowledge.