In regards to picking up ‘keywords’ on programs such as Eschalon they are not listening unless certain ‘keywords or phrases’ get flagged and then they still pursue a warrant to target US citizens for surveillance (which was supposed to be the reason for the FISA court)in due time.
But in the case of foreign entities then no warrant is needed. Nor should one be needed.
That is freaking hilarious, so hilarious that Congress back in the late 1990’s wanted to look more closely at the NSA due to “instances” of abuses. Of course the NSA gave them a bunch of flack. Why the flack if they were so pure? Hell, Congress had no idea what they were doing, how comforting.