I never quite understood this law. While we have freedom of speech, if I get in front of the White House and start yelling I am going to kill the president, I can get arrested? So how is that any different than minority hate speech? The President is the ultimate minority, of one.
Clearly, we can't say anything we want _even_ under the current law.
If you stand in front of my house and threaten to kill me, the cops will be notified as well. It's just that the President has better cops. Freedom of Speech does not cover the right to promise harm delivered upon another.