Bingo! That is the reason the Rats do not want him briefed. Zero and Hillary’s dirty laundry are currently “TopSecret”. If Trump tells us what he finds out there could be hell to pay.
Don't expect the briefings he gets to include even a hint of the smell of dirty laundry.
The various agencies have been compromised for at least the last seven years, perhaps longer. The Snowden releases confirmed it.
It's not like the old days of the Cold War when we were all playing on the same team.