I understand. I'm not American, but if I was (or even if I wasn't), if a similar US agency would "summon" me, I'd be scared as hell. And in that situation I'd think "let me talk to a lawyer first" a lot sooner than I would here (even though it might be smart here, too).

ErrantX also brings up a good point about translation, "summon" could mean something as simple as a phonecall asking for a meeting, without any implication that one may be in trouble. Probably not something one would expect to find themselves being threatened with jailtime.