One feels that Paul doesn't quite have a full grasp of the techniques he's describing (and it sounds like he's conflating a lot of stuff that Snowden leaked), but that headline sure gets the clicks, so let's go with it. Especially since it's Greenwald, who uses Paul's jumbled mess of an explanation to burn everything down.

Doesn't even make sense what he's proposing: Instead of getting a warrant to record the American, the NSA targets the foreigner? But what if they call someone else overseas? Or call people in the US? Seems like a really suboptimal way of targeting someone. And a low-level employee could unmask the caller? Sure, and that could also lead to that employee getting fired and prosecuted. I can access lots of data at work, but I would be shown the door and possibly sued if I did so.