Canadian Prime Minister Mark Carney hopes to secure a majority government by winning votes in three districts. His efforts focus on a toss-up district in Montreal and two safe seats near Toronto.

Canadian Prime Minister Mark Carney is on the verge of securing a majority government as special elections are held in three districts on Monday. Votes are being cast in the Toronto-area districts of Scarborough Southwest and University-Rosedale, which are considered safe seats for Carney’s Liberals, and in the Montreal-area district of Terrebonne, which is considered a toss-up. Winning just one of them would give Carney a majority. The Liberals now have 171 members of Parliament in the House of...