hundred different potential sources of investigation. and the smaller the number is, the easier your investigation is. so the number is relevant. i concede the culture is relevant. nsa, fbi, what other u.s. government agencies have the authority to unmask a u.s. citizen's name? >> i think all agencies that collect information pursuant to fisa have what are called standard minimization procedures which are approved by the fisa court that govern how they will treat u.s. person information. i know the nsa does, the cia does, obviously the fbi does. i don't know for sure beyond that. >> how about main justice? >> main justice i think does have standard minimization procedures. >> so that's four. nsa, fbi, cia, main justice. does the white house have the authority to unmask a u.s. citizen's name? >> i think other elements of the