If the spy agencies have blackmail material on all the politicians you have a Chekist state
The US politicians who think blanket spying on their own peaceful citizens is okay, but spying on two-face war-mongering foreign politicians and government officials is somehow wrong need to be schooled by US voters. (Same with UK politicians.)
You're with a foreign government, especially a hostile or semi-hostile government, you're a fair game target for espionage. Israel, Thailand, Columbia, Brazil, Argentina, India, Pakistan, China, Russia, they're not in NATO so they should expect us to spy on them and we should expect them to spy on us. (The US even spies on NATO ally government officials)
Elected officials corresponding with such non-allied governments should expect to be caught up in this when their communications are with such foreign governments.
Targeting the political discussions of your own peaceful civilians on the other hand should be prohibited.
A democracy where the spy agencies have blackmail material on all the politicians and community activists is not a democracy but a Chekist state.
The problem is spy agencies spying on the private lives of citizens (including current and future politicians), not their spying on official and semi-official communications.
We're rapidly becoming worse than the USSR and joining Putin's Russia in our level of internal spying.