This was not an official 'protest'; and surely the President has a 'right or two' himself.
Maybe people with signage who want to be up close and personal and in your face; need a 'protest permit'. Would be a good idea; otherwise they may totally block the accessibility/view from those who want to enjoy the visit as it was intended.
Protest signs can be held; and observed and appreciated and even make it on TV!!! without the people holding them; hogging, disrupting and spoiling the whole event for everyone else.
As I pointed out in my post #264, this was a hyperventilating fiction concocted by the Socialist fellow-travelers, who used the arrest of the lone jerk to concoct a bunch of theories about "whut woulda happened".