It's laughable when he cries fake news anytime something negative comes out against him. He's literally said, on camera, that anything negative said about him is fake. This, coming from a guy who regularly uses Alex Jones / Infowars as a source of his information and blasts it as though it were the irrefutable truth.
As for the "leaks" he is calling information released publicly a leak. Things that released sneakily and behind anyone's back. Its obvious that he's clinging onto catch phrases hoping that the people that follow him blindly will continue to use leak and fake news as credible or meaningful information.
As you can plainly see, all the accusations, smack talking and moaning have zero facts, evidence or proof behind them at all. All he has to do is say fake news when CNN or the NY Times release something that portrays him in a negative light.
All that being said, he may very well do a good job as president. I don't think he's made a lot of great choices at this point, he's obviously very insecure and lashes out wayyyy too much, but if he chilled out a bit and stopped making shit up and focused on actually making America great he might be able to do a good job.