As our institutes have recently argued, re-grounding U.S.-Canada trade in a broader deal would see the stock of Canadian direct investment in the U.S. increase by $450 billion over 5 years, and more than $1 trillion over ten years, unlock major Canadian defence spending, strengthen America’s northern border, help keep China at bay and increase prosperity for both Canadians and Americans. These outcomes should command even Trump’s attention. But they require both sides to end the threats, prevarication and political posturing that have defined the relationship since his re-election.