A deranged student succeeded in scaling the White House fence and making it almost to where Trump was at the time:
The student was a graduate of San Jose State University and had been living in his car. He had two cans of mace in his backpack. A former Secret Service agent warned that Trump is not safe from any well organized attack. This marks yet another failed instance of the Secret Service, which failed to protect JFK and Reagan. At this point, it is clear that the White House perimeter is under-secured.
What needs to be done is to put the Marines in charge of defending the gates to the WH. They are already charged with protecting US embassies abroad, and are better equipped to deal with today’s threats in terms of preventing people that shouldn’t be on the grounds. They would also be a much more intimidating deterrent to the average intruder.