[nl]

Like when the CIA infiltrated the 2012 French election?

No, not like that at all.

The claim there is: All major French political parties were targeted for infiltration by the CIA's human ("HUMINT") and electronic ("SIGINT") spies in the seven months leading up to France's 2012 presidential election.

That's dramatically different to actively trying to (a) make US citizens lose faith in the US election system and, (b) influence the election outcome.

Reading the CIA leak, it seems like pretty sensible questions. The ethics of spying during an election could be argued, but I think it is entirely reasonable for every country to be trying to understand similar things listed in that document ("What policies do they promote to help boost France's economic growth prospects?", "What are their opinions on the German model of export-led growth?" etc).