Officially need court order. Unofficially "court order - lol,whatever".

Of course Q claims Snowden is CIA asset used to compromise NSA,but look, official reason why Snowden did what he did is "unlawful spying Americans by NSA"... Maybe if Q and military will come we will be sure NSA isn't doing such things,or at least if is doing we will be sure that if anyone is spying it are good guys who are spying Americans unlawfully because of enforcing law against criminals - not for some other sinister purposes like rogue intelligence agencies in many countries do :/