It’s becoming clear that for the next few years American foreign policy will be shaped by the struggle among Republican regulars, populist ethno-nationalists and the forces of perpetual chaos unleashed by Donald Trump’s attention span.

The Republican regulars build their grand strategies upon the post-World War II international order — the American-led alliances, norms and organizations that bind democracies and preserve global peace. The regulars seek to preserve and extend this order, and see Vladimir Putin as a wolf who tears away at it.

The populist ethno-nationalists in the Trump White House do not believe in this order. Their critique — which is simultaneously moral, religious, economic, political and racial — is nicely summarized in the remarks Steve Bannon made to a Vatican conference in 2014.

Once there was a collection of Judeo-Christian nation-states, Bannon argued, that practiced a humane form of biblical capitalism and fostered culturally coherent communities. But in the past few decades, the party of Davos — with its globalism, relativism, pluralism and diversity — has sapped away the moral foundations of this Judeo-Christian way of life.