As far as protests go, publicly scaling a large building using suction cups probably isn't the most effective. But whatever his motives, there's an unidentified man currently climbing up the side of Trump Tower right now if you're into watching that sort of thing. He's currently about five floors above a landing.
"Wait... So you can just climb over a wall?" —Trump right now, probably.
Police are currently at the scene and have closed parts of Fifth Avenue in order to respond to the incident.
Check out some video of his climb below.