The Guardian strongly implies this system is used to intentionally target US citizens in violation of the law, but then admits that would be "illegal." I wonder if the leaked presentation touches on this point.
The Guardian doesn't 'admit' anything (it wasn't hiding anything in the first place), and legality doesn't predict whether actions are being taken or not.
>I wonder if the leaked presentation touches on this point.
That seems unlikely to me, as this is a technical presentation.