The status quo is not going to cut it for Canadian Prime Minister Mark Carney at his Tuesday meeting with President Donald Trump in Washington. With an unemployment rate of 7.1%, the highest level in nine years and half a percentage point higher since the start of this year, Canada’s economy is faltering. Steep tariffs Trump slapped on cars, steel and aluminum — key Canadian exports to the United States — are making matters worse. And Carney’s meeting is happening just as Trump is prepared to deal another blow to the Canadian economy: tariffs on softwood and lumber, among the...