Arrested, doubtful.
There is no Sheriff in DC.
And no other LE presence would have the backing ro make that arrest of a sitting president. Plus figuring out the jurisdictional matters are a logistical nightmare.

If it comes to it, and doubtful it will, he will end up like Mussolini.
Heck, even the Secret Service has been advertising their holes and weaknesses. These guys aren’t that incompetent, so maybe its a sign of the times.

And much of the problem charging them stems from the laws themselves. Proving their behavior as criminal, proving the intent, the negligence, especially when the procedures will have to pass the “reasonable man” standards.

Being an idiot is not a crime, especially 2000 miles away.