Mark Carney can shine on the world stage, but he must first talk Donald Trump out of his trade war

News Snapshot:

Open this photo in gallery: Prime Minister Mark Carney arrives at his office on Parliament Hill on April 29, in Ottawa.DAVE CHAN/AFP/Getty Images The global establishment has found its hero. In Europe, Mark Carney’s election victory was celebrated as a repudiation of everything Donald Trump represents. Multilateralists everywhere are hailing Canada’s Prime Minister as their champion and populist slayer. Mr. Carney is a natural for the role. He is more comfortable working with cerebral European leaders on new alliances than negotiating with the low-information U.S. President. As a CNN reporter wrote this week of Mr. Carney: “You don’t get much...