Nothing. But what he might do is to confiscate the trucks and have the military and police driving them. That would be a dictator’s next step right before he starts lining people up for firing squads.
I know this sounds like crazy talk. But we are all shocked at what the Canadian government (and the Australian government) are willing to do to their citizens.
They’d still need to stop to refuel.
I don’t think it is crazy. And I think it will cross the border much faster than we expect. We need to keep our eyes wide open here in the US because it will happen here too, but here, shots will be fired (on both sides).