On almost a daily basis, the media asks: What is the Trump Doctrine? As if the question itself could somehow impart a conceptual structure to a lifelong habit of mind for “winging it” — bluff, bluster, threaten and deceive for a (tactical) advantage without a thought to a governing principle.The notion of a Trump Doctrine is itself a contradiction in terms. Trump proclaims that he likes to be “unpredictable,” to surprise ally and enemy alike. When did unpredictability become valuable in an …