So, we've all heard, by now, Scott Walker (R-Fantasyland) thinks that a wall along the Canadian border is "a legitimate concern".  Canada's Defense Minister had words about that.
I would remind that governor or anyone else in the United States of the enormous progress that we have made beyond the [border] agreement that Prime Minister Harper signed with President Obama, which massively improves continental perimeter security. As you know, we often find there are some American political actors who are not aware of the progress that has been made on continental security.
So we'll continue to remind our American friends that Canada has taken extraordinary efforts to ensure the joint security and you know I don’t think—quite frankly I can tell you as the former minister of immigration, that Canada has a much greater legitimate concern about the northward flow of illegal migration than the United States does of a southward flow of illegal migration
(bold = my favorite line of the whole thing)
And of course, his campaign is saying he didn't really suggest a wall.  Funny, he tweeted later in the day that he "wouldn't ignore concern expressed from law enforcement".  I'd love to know who these law enforcement people are.