Forget about a “right” to be heard, there ARE limits on free speech.
You cannot commit perjury, slander, libel, treason, incite people to violence...
Falsely yelling fire in a crowded theater is but one example of speech that is not protected by our Constitution. Treason (aid and comfort to our enemies in a time of war) is explicitly defined in our Constitution.
Agreed, this guy should investigated for treason and citing violence against the President.