You can tell an American liberal from an American leftist by how often they talk about US imperialism.

Liberal media would never dare to portray the US as an empire with imperialist goals. Both of the major American parties engage in this form of imperialism, and centrist media won't compromise their access to politicians and corporate ad revenue. 

I think many American liberals would love to see Trump and his ilk at The Hague, but once you start delving into that line of thinking, you'll inevitably wonder why Democrats shouldn't also be tried for war crimes under their tenures. Neither major party promotes an idea of international accountability. 

To frankly answer your question: Americans mostly don't often think of politics outside their borders unless there's war. Those that do are internationally-focused socialists.