Trump's biggest first-term trade impact was to shatter decades of political consensus favoring ever-lower trade barriers.

When President-elect Donald Trump recently floated the idea of annexing Canada, a key reason he gave was a claim that the United States was “losing $200 billion a year” to its northern neighbor.

Prime Minister Justin Trudeau says if “push comes to shove” Canada is ready. Ottawa has a set of retaliatory measures set to drop on Monday if Trump takes action, a senior federal source told POLITICO on the condition of anonymity because they were not authorized to discuss the details publicly.