WASHINGTON (AP) — The National Security Agency on Friday said its tracking of cellphones overseas is legally authorized under a sweeping U.S. presidential order. The distinction means the extraordinary surveillance program is not overseen by a secretive U.S. intelligence court but is regulated by some U.S. lawmakers, Obama administration insiders and inspectors general.

Documents obtained from former NSA contractor Edward Snowden showed that the NSA gathers as many as 5 billion records every day about the location data for hundreds of millions of cellphones worldwide by tapping into cables that carry international cellphone traffic. The Washington Post said the collection inadvertently scoops up an unknown amount of American data as well.