Utterly irrelevant, though this is the copy/paste regurgitated reply whenever it's mentioned.
Go yell fire in a theater right now. You will be hit with a variety of fun charges. Just as you have absolutely no right to announce threats against other persons, most defended being the president or any other politician.
All speech has limits.
Because speech has worldly consequences.
Most likely, you'll just be thrown out of the theater.
If you actually dircectly provoke a riot by doing that, then you'll be subject to criminal sanction. Without inciting imminent lawless action, it's protected speech.
> All speech has limits.
Free speech has limits, but the “fire in a crowded theater” example (and the “clear and present danger” rule it came along with) is not an valid example of the limits (or the operative rule).
This is example comes from dubious (in terms of it's accuracy in reflecting even the then-current state of Constitutional law) dicta in a since-overturned case upholding suppression of core political speech.