Republican presidential candidate Scott Walker, a staunch advocate of securing the southern border, says building a northern wall on the US border with Canada is a “legitimate” idea.
"That is a legitimate issue for us to look at," the Wisconsin Republican governor said Sunday on NBC's "Meet the Press."
Walker said the idea was brought up to him in a recent town hall meeting in New Hampshire.
The notion of a wall on the northern border is a shift from the current rhetoric in the race which has focused on beefing up security on the border with Mexico, where millions of immigrants have illegally entered the United States.
"It wasn't just about building a wall and securing our borders," Walker said. "It was also about making sure our intelligence community has the ability for counterterrorism and the ability to go after the infrastructure they need to protect us."
Republican frontrunner Donald Trump has consistently called for the construction of a towering wall along the border with Mexico.
The issue has become a hot topic for Republicans since the first GOP debate earlier this month.
Walker surged into the top tier of the GOP race in winter but his candidacy has wilted in a campaign season dominated by Trump.