Here is an editorial by Victor Davis Hanson, Reciprocity is the method to Trump’s madness.

Critics of Donald Trump claim there is no rhyme or reason to his foreign policy. But if there is a consistency, it might be called reciprocity.

President Trump tries to force other countries to treat the U.S. as it treats them. In “don’t tread on me” style, he also warns enemies that any aggressive act will be replied to in kind.

The underlying principle of Trump commercial reciprocity is that the United States is no longer powerful or wealthy enough to alone underwrite the security of the West. It can no longer assume sole enforcement of the rules and protocols of the postwar global order.

This year there have been none of the usual Iranian provocations — frequent during the Obama administration — of harassing American ships in the Persian Gulf. Apparently, the…