Like I said, the first thing is to make sure that, when an incident like this arises, you don't overreact right away: Bide your time, say that you are investigating this, and bring the temperature down, because if you react in an emotional way, you're going to create all kinds of further complications with the issue. That, I suppose, is the first thing.
In terms of avoiding a situation like this, the whole question of vetting comes up. How do you vet these invitations or whatever? That's a complicated issue, and that's on Parliament to figure out. I'm not sure how you try to vet this, given all the people who come from all over the world with all kinds of backgrounds, bringing all kinds of issues with them. It's not such an easy thing to resolve.