U.S. intelligence shows that Iran's supreme leader is effectively holed up in an undisclosed location with little access to the outside world and is only reached by a labyrinth of couriers, according to U.S. officials with knowledge of the matter.  The Iranian officials authorized to work with the Trump administration have been having a difficult time communicating inside of their own government system — and it's a central reason why the details of a potential deal with Iran and past agreements