MEANWHILE IN CHAMPLAIN, NEW YORK

Migrants have been coming to places like Roxham Road not because they want to sneak over the border; the expectation is to walk right into the arms of the Canadian authorities. An agreement between the United States and Canada makes it virtually impossible for them to ask for asylum at a legal border crossing; Canadian border officials would have to turn them back. But a technicality allows them to bypass the agreement by illegally setting foot in Canada.