A trade war will serve neither side, something businesses on both sides of the border understand with crystal clarity, so I doubt that the government, regardless of what you may think of Trudeau, is being that poorly advised on this front.

As for the manufacturing jobs coming back? Nope, not happening. Those jobs lost to the 3rd world are forever lost there unless the American heartland is willing to work for a couple of dollars a month or willing to pay much, much, more for their goods. Neither is going to happen. Those jobs lost to automation? Truly gone forever.  Imposing tariffs on imports? Only going to raise the price at retail. Long and short? There's no winning on a trade fight here.