If the President of the United States is a liar, it is the duty of responsible media to point it out.
If you really believe this is going on, you need to think long and hard about that.
If you take Trump out of the mix for a moment, and look back further, let's say 8-16 years, the MSM has stopped keeping the presidents in check, and rather has sided with them based on their affiliations (left vs. right, CNN vs Fox). You are correct, the media SHOULD be there to keep politicians in check, that responsibility resting on the mainstream media is dying by the day, the internet has done a far better job not being puppets of Clinton, Inc or the GOP.
CNN is well beyond reporting facts to constructing conspiracies and censoring opponents. Saying CNN & Fox or any news like them is honest in their reporting is absolute madness.
I don't care how much you hate Trump, I have no idea how anyone can stomach the smug nonsense that is CNN. And many other liberals feel this same way. Thinking the mainstream media is a complete farse is not a radical right wing conservative idea.