Another place where Canada can hurt the US is electricity. The country sends electricity to more than 20 states in the US through integrated cross-border transmission lines.

Trump lashes out at Ontario Premier Doug Ford calling him ‘less intelligent’ than late brother Rob - President Donald Trump slams Ontario premier as tariff tensions escalate by comparing him unfavorably to his deceased sibling,

The Ontario premier says the states are "politically significant... to the current administration's base of support."

"I ⁠think that's the government intention," LeBlanc said when asked on ​CNBC when the tariffs on goods imported from the U.S. might be announced. "It shouldn't surprise anybody. Our friends and the American administration,