Trump is not delusional. He is consciously doing his best to destroy the US and what it stands for.  Just because he is POTUS it does not mean that he is loyal to the US. Maybe he is a Russian puppet maybe not but something has pi$$ed of Trump enough to want to damage all its institutions.
The media are complete suckers as they follow his inane tweets as they are a distraction, a feint as he quietly go one undermining the institutions. Calling the media fake news is another distraction ploy as they try and prove the news is not fake.