(Speaking as a Canadian who has watched 30 years of continental economic integration and heard lots of friendly talk since the campaign for the 1988 Free Trade Agreement but now back of the line waiting for vaccines imported from Europe because the US won't export to us and our domestic manufacturing was sold off decades ago because of said continental integration.)

Also the US itself has used the "national security" excuse for trade issues multiple times over the last few years where it was seemingly not the case (steel & aluminum trade disputes, etc). So the precedent has been set. And there's little sign of Biden really doing much to reverse that.