Vivek Ramaswamy donned a Patagonia jacket and used a hiking trail to cross from the United States into Canada last week without displaying his passport, cameras in tow. Nikki Haley and Ron DeSantis each went out of their way to call out the northern border in speeches to Republican activists in New Hampshire on Friday night.

The Republicans running for president are ramping up their rhetoric on immigration, defined for the better half of a decade by Donald Trump’s promise to build a wall between the United States and Mexico, by adding the border between the United States and Canada to the list of places they’d like to see a crackdown.

All three candidates have mentioned the Canadian border in their visits to New Hampshire this month, the first-in-the-nation primary state which shares a 58-mile border with America’s neighbors to the north.

“We will have enforceable borders, including the southern border and the northern border here in New Hampshire,” DeSantis said, to applause, during a speech at the state Republican Party’s leadership summit in Nashua on Friday night. “We’re going to do that by, on day one, declaring it to be a national emergency. We’re going to mobilize all available resources, including our U.S. military. We’re going to stop the invasion cold when people come in illegally.”