Not if NSA has enough dirt on each congress-person (or their family)

Or if they use their secret NSA drones to drone strike them.

Good point! I checked, and it turns out that it is not written in any law passed by congress that the NSA is explicitly empowered to extort congressmen for its own ends. So, yeah, that guy is just crazy for suggesting such a thing.

They don't need to, when the surveillance ensures compliance with the implied threat. Or are you just trolling?

Yes, he is mocking you by suggesting something outlandish to imply what you are suggesting is also outlandish.

Nevermind that politicians being blackmailed is hardly unheard of...