The FISA court has a single purpose ~ to issue warrents upon presentment of probable cause that there's a foreign agent or sabateur mucking up the works INSIDE THE USA. I don't think there was any secret that we tap the world ~ as do the other guys eh! Our courts have no extraterritorial authority.
The question is whether or not they've actually limited themselves and NSA operations to that condition, or have they gone beyond what we were told was their authority.
Your typical European Star Chamber actually condemns people and draws and quarters them on the plaza just below their window. We don't do that.
Not yet.
The first step is labeling the citizenry as terrorists. The rest follows logically.