WASHINGTON—A prominent U.S. presidential candidate appeared to entertain the idea of building a border wall with Canada when pressed Sunday in an interview about national security.

The issue was raised with Republican contender Scott Walker in a talk-show interview. He didn’t bring it up himself, but didn’t shoot it down when asked.

“Some people have asked us about that (idea) in New Hampshire. They raised some very legitimate concerns, including some law-enforcement folks that brought that up to me at one of our town-hall meetings about a week and a half ago,” the Wisconsin governor said during an interview with NBC’s Meet The Press. “So that is a legitimate issue for us to look at.”

But instead of dwelling on the issue, Walker quickly switched the subject to the Middle East, rebuilding the military and national security. The exchange about Canada never even made it to air. It was edited out of the interview highlights that ran on Meet The Press, and was posted on NBC’s website.

The context for the whole conversation was the roiling U.S. debate about the Mexican border. Occasionally, the polemic fleetingly touches upon the 49th parallel.

It’s not a subject actually being raised in 2016 political platforms — but mainly by media commentators pressing conservatives to explain their obsession with the Mexican border.

A good example is a piece in Politico magazine last fall titled, “Fear Canada: The real terrorist threat next door.” The first 18 paragraphs were about Mexico. Before the word “Canada” was mentioned once, the piece attempted to demolish a Republican talking point about Islamic State terrorists supposedly sneaking across the Rio Grande.

The theme resurfaced Sunday.

In a week when Walker himself raised the terrorists-from-the-south theme, and amid a Republican primary in which the poll-leader, Donald Trump, wants to deport 11 million illegal migrants and build what he calls the Great Wall of Trump, an interviewer asked: Why Mexico and not Canada?

It was the interviewer who twice raised the Canadian border. NBC host Chuck Todd challenged Walker to explain the focus on the south and, in doing so, he referenced terrorists coming from Canada.

It’s unclear whether he was referring to the repeatedly debunked canard about the 9/11 hijackers. The most famous incident of a terrorist crossing from Canada was failed millennium bomber Ahmed Ressam, although several American political figures over the years have repeated the erroneous claim about the 9/11 hijackers coming from the north.

Todd asked the governor: “The most famous incident that we had of terrorists coming over our border was on our northern border. Why aren’t you talking about securing the northern border?”

Walker replied that he favoured securing borders in general but said the more rampant current problem was on the southern border.

Todd pressed him again, prompting Walker to mention the northern frontier, in passing.

It was reminiscent of an exchange a few days earlier. Once again, a media personality raised Canada as a point of comparison while chiding a conservative for the southern-border obsession.

The why-not-Canada question was posed in that case by the most famous Spanish-language journalist in the U.S., prominent Trump-nemesis Jorge Ramos.

The Univision network anchor, who was momentarily expelled from a news conference after he confronted Trump, raised it in an interview with a Fox News host.

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He asked Sean Hannity: “You’re going to do it at the border with Mexico, but how about the 5,000 miles between the U.S. and Canada?” The conservative TV host replied: “I would do it up there, too. I would do it up there, too.”

Canada’s defence minister weighed in when asked about Walker’s remarks Sunday, although he said he hadn’t yet heard them. In response, Jason Kenney said Canada would protect what he called the largest bilateral trading relationship in economic history.

“Of course we would vigorously oppose any thickening of the border,” he told an Ottawa news conference.

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