Nothing will stop them from using their tools anywhere, which is my point. When the agencies themselves are fundamentally untrustworthy, as they have repeatedly demonstrated themselves to be, the distinction between surveillance domestically and abroad isn't meaningful. Especially with the data sharing rules Obama pushed through at the end of his presidency.
I don't think it's possible to value open and free societies while spying on the entire world for the purposes of asserting your geopolitical dominance. Freedom for me but not for thee.
I have no doubt that these tools are used against domestic targets, perhaps not from the CIA but certainly by agencies like the FBI - I work in aviation and routinely see mystery flights. Everyone in the office can guess what they are (http://imgur.com/a/17hSR - 6 hours of circling - Maybe they had a warrant, who knows.
My point was that even if we could somehow stop domestic mass surveillance, I'm not sure it we would stop using them internationally or even have any obligation to do so?