Um, we kind of DO need Canada, Don. They are our biggest foreign source of minerals, supplying about $47bn worth each year. Half of the nickel. Germanium, gallium, and oh! - uranium. 60% of all the aluminum the US uses each year comes from Canada. We use it for shell casings, ship hulls, and aircraft fuselage. The F-35 fighter jet’s airframe is about 40% aluminum. So - Trump quietly removed almost all metals from the products subject to the new 50% import tariffs. But Canada might not want to continue to sell them to us if Trump keeps it up.