Mass murder on the high seas (Venezuelan "drug boat")

Congress? Irrelevant.

I don’t think it’s so obvious, bombing almost surely , a full scale invasion not at all.
Trump seems to be allergic to things that require continued effort and focus, luckily.

Like marriage? Like rule of law? Like Democracy?

Among other things.

Any chance of the ICC charging him with a crime, which could prevent him from traveling to many places?

Uh-huh.
Who’d enforce that?

Of course, nobody is going to arrest him, but they don’t have to let him land.