If the president stays on MacDill, he will be perfectly safe. The Security Police aren't going to just let anyone on the base.
I sure do hope their security police are better than the ones at a post here in Arkansas. Recently an arab tried to get on post using a fake Saudi student ID. Had no license plate on his car, no registration and was asking questions about the military units on post. The security guard didn't let him on post but didn't think to call the MPs until after he had already left. Really dumb.