The Trump administration is threatening a 25% tariff on all imports from Canada and Mexico as soon as Saturday — a move that would almost immediately impact car dealerships and factories in the United States.

Tomatoes, T-shirts and cars are among the vast array of goods that could become pricier if tariffs pledged by President Donald Trump go into effect.

If President Donald Trump puts a 25% tariff on products coming from Canada starting next weekend, as he said this week he is considering, electricity costs in Massachusetts could increase by as much as $200 million a year, Gov. Maura Healey told business leaders Thursday morning.