Today the US Administration has slapped import tariffs on steel and aluminium from Canada, Mexico and the European Union.
Both Canada and Mexico have retaliated by implementing their own import tariffs on a dollar for dollar basis.
These events make any NAFTA renegotiations much less probable.
Nobody wins in a trade war.
Short term effects are higher domestic inflation globally and a lower loonie.
Justin Trudeau has exhibited very strong leadership this week both on the Trans Mountain pipeline issue and by retaliating from the US punitive tariffs.