Iran, AgainDavid Frum often says that Trumpism holds many secrets, but no mysteries. But Iran presents us with the first genuine mystery of Trump’s presidency:Why didn’t Trump just leave? He semi-promised to give Iran what they demanded in order to let him out of the war. And now the war is back on, American soldiers are dying, and—even worse—the price of gas is rising. Iran has vexed Trump because it brings into conflict his two controlling impulses: