It was Scott Walker’s idea.

Canadians want to build a wall; to keep American’s out.

“Imagine the flood of political refugees in the case of a Donald Trump victory in the U.S. presidential election. Millions of shocked American Democrats and other Trump-dodgers fleeing across our Canadian border, seeking political refugee status here in the land of the free(ze).”

{…}

“There’s a lot about guns in these letters and columns. Susan Sacks of suburban Toronto wrote in a letter to the Toronto Star, “If a wall will keep American guns and other American bad habits out of Canada, I’m all for it.”

https://www.washingtonpost.com/posteverything/wp/2015/10/09/the-extreme-lengths-canadians-will-go-to-keep-americans-out/?tid=sm_tw