As the USA minister of defence, he is in all likelihood responsible for crimes against humanity/war crimes, for instance, the killing of people on small boats in the Caribbean, and the hundreds of school girls in Iran, to name just two cases. But who could sue him; it seems it is usually countries that do this, but could eg an organization of international lawyers do this? What would it take for an individual to get him sued? (Asking for a friend).
Well, he doesn’t have to be held in the The Hague.
Right, but that’s where the ICC is. And they will invade where ever it is held, so changing the location doesn’t matter (except if you’re in the Hague I guess).