But if the client was already accused of terrorism, then this monitoring was on his end, and surely covered by a specific warrant. So this isn't (presumably) the kind of massive data hoovering that is the primary concern; every country does this kind of thing. (Back when I was running Despammed.com I'd get requests from various LEOs - one came with a real live subpoena for information related to an identity theft ring, and one was from Italian authorities pursuing an insult to Mary.)
Where it gets to be a concern is revoking a guy's visa because he's defending a terror suspect.