U.S.-Canada trade war set to hit hard in midterm battleground states The Washington PostWhy Canada? America’s northern neighbor seems an unlikely target for a trade war AP NewsA Hostile Trump Reopens Old Wounds in the U.S.-Canada Relationship The New York TimesCanadian boycott of US products pushes grocers to adapt, explore new supply sources ReutersTensions simmer on US-Canada border for two towns relying on each other The Guardian