Concerned people are spinning it all sorts of ways (ex. "if they can censor the POTUS they can censor us too!"), but the fact of the matter is, the 1st Amendment explicitly does NOT protect advocacy of force or violence that leads to "imminent lawless action" (which is I believe how the SCOTUS phrases it). That's what Trump did, and he won't be protected for it. I don't always agree with the law but it's a relief to see that, for once, the president isn't above the law