if the "protestors" were not controlled, could there be a positive assembly of any sort, anywhere?
Eagler, as long as they are peacefully protesting by use of signs, then they should be allowed to get as close to the President,
any president, as the President's supporters.
Of course, if they are not peacefully protesting and are not allowing the President to speak, then they should be removed from the vicinity. I believe in the President's first amendment rights, too.