To the extent he has one, Trump's foreign policy is based on the idea that he will use "credibility' to scare other countries into doing what he wants:
[T]he politics of credibility are complex and ephemeral, and spending time, blood, and treasure to try to manufacture a reputation for toughness is, more often than not, a fool’s game. And foreign policy analysts probably shouldn’t encourage neophyte policymakers to use cruise missiles, aircraft carriers, and MOABs to chase “credibility” around the Pacific Ocean.
