I don't think that walling off every single country in the world will be the ultimate remedy to the immigration crisis, despite that, however, I recognize that walls have worked for countries such as Israel and Germany. (Which separated the homogeneous (to my knowledge) people of Berlin).
When looking at this most people should see this as an opportunity for the Liberal party of Canada to virtue signal a little, and secure some future votes by allowing these people into the country.
RE: Canada Now Wants U.S. To Enforce Its Immigration Laws