[smsm42]

FISC can not call senators and ask them for anything. NSA has to call FISC and ask them if it is legal, if they confirm, NSA can proceed. FISC has no power over senators - if any senator decides something is wrong with surveillance, he can initiate a bill that says you need more approval than FISC or you can't do certain things at all - FISC only confirms that NSA is acting withing the limits that the senators (and the House of course) set the last time. FISC can not create rules - unlike SC, btw, that to a large measure can interfere with the rules, even though Roberts seem to be rather restrained from doing this in many cases where he had a possibility to do so (see Obamacare decision, for example). FISC can only say if NSA follows the rules - and it is the senator that makes the rules.