Trump is targeting illegal immigration at the U.S.-Canada border. Here’s how some migrants cross there. [Video]

An upstate New York sheriff, whose county sits along the U.S.-Canada border, credits President Trump’s immigration policies for a recent lull in illegal immigration, but warned that he doesn’t believe the quiet will last.

Sheriff David Favro oversees Clinton County, New York, which includes about 28 miles of the northern border region the U.S. Customs and Border Protection calls the Swanton Sector. Last year, there were more illegal crossings in the Swanton Sector than in the previous 17 years combined, with more than 19,000 migrants arrested. Favro, a Democrat and six-time elected sheriff, said there’s been a recent lull.

“Today, our state of mind is, ‘When is something gonna happen?’ That’s the big concern. And that’s always in the back of, I think, every law enforcement member’s mind,” Favro said. “When is something going to occur? When the numbers are down it gets eerily quiet and we kind of worry about quiet.”

How some migrants cross the U.S.-Canada border

While the southern …