My understanding is that it's the US memorial services, not the actual funeral. After all, we've got our own lunatics here already, I'm sure (although I'm not convinced they'll go so far as to picket the funeral of someone that the rest of the country is mourning.)

But I'd love to see the battle over whether or not to give them visas. There are some interesting precedents in that area, and we've had a change of government...