Canadian Prime Minister Mark Carney has much more political permission to accept pain from a U.S.-Canadian trade war than Trump does.

Against Canada, Trump is fighting a trade war that very few Americans support, under leadership that most Americans reject, to achieve results that virtually all Americans would dismiss as pointless if not crazy, writes David Frum in The Atlantic.

Against Trump, Canadians are fighting a trade war that the great majority support, under leadership that commands broad assent, to defend their independence and self-respect. That’s a war that even the weaker side can win, especially if it needs to hold on only a few months longer to survive.