Scott Walker, the governor of Wisconsin and a Republican contender for the president's job, has been ridiculed online since raising the idea of building a mammoth security wall along the Canada-U.S. border.

Walker entertained the idea during an interview on NBC's Meet the Press on Sunday, where he called the wall a "legitimate issue."

It's rare to see the Canadian border being discussed during a presidential campaign, as candidates more often talk about the southern border. Walker's fellow presidential candidate, Donald Trump, has called for a "real wall" to be put up between the U.S. and Mexico. And he plans to get the Mexican government to pay for it.

The possibility of a Canadian wall, on the other hand, got a whole lot of laughs online.

Of course, the Democrats also got in on the fun with a little help from Kanye West (another possible presidential candidate?).

Fellow Republican presidential hopeful Rand Paul took a jab at Walker too.

The Kentucky senator told a Boston radio station that a wall between Canada and the U.S. would be a "pretty dumb idea."

Some Canadians responded with a shot of sarcasm... 

... while others put some serious thought into the logistics of how it would be built.

It would be a long wall. The border stretches 8,891 kilometres across land and water.

It wasn't all laughs. One user was seriously concerned at how the proposal would impact jobs, particularly in Walker's home state of Wisconsin...

... while many Americans just felt sorry for Canadians altogether.