Just for clarification, do the US Courts rule on International Law? Is this body of laws even admissible in US Courts?
In simplest terms, "International" Law is a fancy term for custom; in general, it can only be enforced through prosecution in some nation's court system.
Pseudo-international courts like the ICJ can rule on (but not enforce) an action brought by one nation against another, but in this particular case, the US court system is the proper venue -- assuming TC's legal justification is correct, of course.