There are a couple of things Trudeau needs to do to chart a path forward with Trump. He needs to reassure the Americans that we have their back on security. He also must demonstrate that the economies of both Canada and the U.S. have been served well by constant, constructive engagement. He must demonstrate that the relationship is not a zero-sum game, that what is good for Canada in the bilateral relationship is also good for the U.S., and vice versa.