Even when ignoring any Secret Service personell, on thing comes to mind about the private security.
Seems to me that divulging the type and extent of security being provided, would be a breach of security.
It would be stupid and irresponsible for the private company to admit how it's handled.
Sort of a rule one of the fight club, deal.
To me, the question is not are they armed, as to how well, they're armed.