The moment from SNL that really upset Trump seems to have been when they suggested that he will be charged with crimes after the Mueller report drops.
SNL hit a nerve with Trump
Alec Baldwin As Trump said, “So I’m going to sign the paper for emergency, and then I’m going to be immediately be sued, and the ruling will not go in my favor, and then it will end up in the Supreme Court, and I will call my buddy Kavanaugh and say time to repay the Donny, and he’ll say new phone. Who dis? And then the Mueller report will be released, crumbling my house of cards, and I can just plead insanity and do a few months in the puzzle factory, and my personal hell of playing president will finally be over.”
— Sarah Reese Jones (@PoliticusSarah) February 17, 2019
Trump responded to SNL by demanding retribution
Trump responded by complaining about SNL:
Nothing funny about tired Saturday Night Live on Fake News NBC! Question is, how do the Networks get away with these total Republican hit jobs without retribution? Likewise for many other shows? Very unfair and should be looked into. This is the real Collusion!
— Donald J. Trump (@realDonaldTrump) February 17, 2019
It wasn’t just that SNL called his wall declaration fake. It was their suggestion that Trump is a crazy loser who is committing crimes that are going to bring him down that set the president off.