Canadian officials and experts believe that the jump in illegal crossings has been fueled primarily by immigrants arriving in Canada from India on tourism or other temporary visas.

In a characteristically bombastic threat to slap hefty tariffs on Canadian and Mexican imports to the U.S. once he takes office next year, president-elect Donald Trump said he was motivated by border issues between those countries and his own.

President-elect Donald Trump has threatened tariffs of 25% on imports from Canada and Mexico until fentanyl and undocumented migrants stop flowing over US borders. Canada says it has a plan to boost border security — and points to US government data that show most of the problems come from Mexico.

Canadian Prime Minister Justin Trudeau says he spoke with President-elect Trump Monday evening about his tariff pledge and vowed to address concerns the incoming administration might have about its northern neighbor.

Prime Minister Justin Trudeau and the premiers will meet Wednesday to discuss strategy as president-elect Donald Trump threatens to upend the bilateral relationship with punitive tariffs on everything Canada sends to the U.