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).
I find it upsetting that people see this comment as hyperbole when it has been the stated position of the US government, enshrined in law, since 2002.
Literally begging americans to learn about their own country instead of accusing everyone who opposes them as being paid by the russian government to interfere in their elections.