Republican presidential candidate Scott Walker's idea of building a wall to separate the United States and Canada is being called "crazy" and "dumb."
Democratic Vermont Senator Patrick Leahy on Monday called it "one of the craziest" ideas of the presidential campaign.
Mike Murphy, the head of the Right to Rise super PAC supporting Jeb Bush, said on Twitter that Walker was distracted and focused on building a wall between the U.S. and Canada. Murphy's tweet ended with the hashtag "#NotReady."
Kentucky Senator Rand Paul called it a "pretty dumb idea" in an interview on Boston Herald Radio.
Walker said on NBC's "Meet the Press" on Sunday that the issue of border security in the north had been raised by law enforcement officials during a recent town hall in New Hampshire.
Scott Walker's presidential campaign spokeswoman says the Wisconsin governor is not advocating for building a wall separating Canada and the United States.
Walker spokeswoman AshLee Strong said Monday that Walker's comments on the issue had been misinterpreted.
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