These last few weeks have clearly demonstrated that the critters in the swamp definitely don’t like any attempt to drain the swamp. A lot of these critters are extremely dangerous. It’s obvious that the swamp is very deep within the so-called Intelligence Agencies. If the swamp is deep inside the Secret Service, Trump is very much in danger, and if he’s in danger, we are all in danger.
I think you are correct, that Trump is in great danger. Right now how can Trump trust ANYTHING the CIA, NSA, FBI, DIA, DHS etc... brings to him as intel. They have all destroyed their credibility.
As far as the Secret Service being corrupt I would expect it to be the case as well. If I were Trump I would keep a private security person or two near me and tell the SS to deal with it.