The best example came in April, when Haley went on the Sunday talk shows to promise new sanctions on Russia for its role in abetting the Syrian regime after a chemical weapons attack. White House officials walked it back the next day. When White House economic adviser Larry Kudlow suggested Haley may have been confused, the ambassador responded: “With all due respect, I don’t get confused.”

This tension reflects a wider rift within the Republican Party. Traditional conservatives embrace American exceptionalism and chafe at the UN vision of a community of nations, all deserving equal respect. Trump takes a different view. As he said in his address to the UN General Assembly last month: “I honor the right of every nation in this room to pursue its own customs, beliefs and traditions. The United States will not tell you how to live or work or worship. We only ask that you honor our sovereignty in return.”

In this respect, Trump might be called a transactionalist. Haley is clearly an exceptionalist. In a speech last May at the International Republican Institute, she said the UN’s “foundational dilemma” was that “it is set up to treat all countries the same.” She went on: “But all countries are not fundamentally the same. When you try to pretend that there is no difference between the good guys and the bad guys, that’s always a win for the bad guys.”