Scott Walker said he'd consider building a wall on the U.S.-Canadian border

Gov. Scott Walker (R-Wis.) has had a tough time clarifying his immigration platform in recent days, wavering on whether he supports birthright citizenship. The presidential hopeful called that debate a distraction in an interview for NBC's Meet the Press, focusing instead on border security.

Walker took the familiar Republican proposal to build a wall along the U.S.-Mexican border one giant step further Sunday. He said he'd also consider building one along the U.S.-Canadian border, which runs 5,525 miles long.

"Some people have asked us about that in New Hampshire," Walker said. "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. So that is a legitimate issue for us to look at."

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Watch Walker's full interview with Chuck Todd below. Julie Kliegman