Okay, so there could be, generically, national security considerations.
The reason I ask is that Brunei, which I note is a country we're negotiating with as part of the Trans-Pacific Partnership, last spring adopted a form of sharia law that punishes homosexuality and adultery by death in that country, and criminalizes other things. You can have appendages removed for various acts.
I just wonder if considerations like that would be part of a decision as to whether or not we would want to expand the transport of people between the two countries.