Justin Trudeau is expected to announce as early as Monday that he will resign as Liberal Party Leader, three sources said Sunday, as the Prime Minister faces a caucus revolt and dismal public opinion polls that show his party will likely be swept out of power by Pierre Poilievre’s Conservatives. The sources stressed that they don’t know definitely when Mr. Trudeau will announce his plans to leave but said they expect it will happen before a key national caucus meeting on Wednesday. The...