Trump's trade war with Canada could rattle economies in states with key Senate races

President Donald Trump's escalating trade war with Canada threatens regional economies in U.S. states situated along the Canadian border, according to reporting datelined from Portland, Maine. The developments come as the midterm elections approach and control of the U.S. Senate hinges on these border states.

The economic fallout poses a challenge to Republican efforts to alleviate voters' economic concerns during an election cycle where maintaining Senate control is a central political objective.