President Trump this week will put his bare-knuckles negotiating strategy to a new test, as his aides resume efforts to persuade Canada to sign on to his vision for overhauling the North American Free Trade Agreement, the pact he has long branded a disaster.
Mr. Trump set the stage for talks slated to reopen on Wednesday with holiday-weekend tweets threatening Ottawa with expulsion from the bloc, which includes Mexico, and attacking two U.S. groups whose support he needs to enact a new Nafta: Congress and organized labor.
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