President Donald Trump has one well-known and exploitable weakness: His inordinate love for the triumphal announcement that he has brokered a deal. This inordinate love has already spawned two terrible blunders that threaten us all, one actual and one potential. The actual blunder is the welcoming of Chinese students into American Universities. This blunder stems from his failing to recognize that every Chinese student is a spy. This is not to say that each and every Chinese student is actively engaged in spying at every moment. But it is the case that each and every Chinese student is legally obliged...