“We’re going to put our list together, and I’m sure the other provinces will as well. But we will go to the full extent, depending on how far this goes. We will go to the extent of cutting off their energy,” Ontario Premier Doug Ford said after meeting with Canadian Prime Minister Justin Trudeau and other provincial premiers.

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“We will use every tool in our tool box to fight back. We can’t sit back and roll over. We just won’t as a country. And isn’t this a shame, our closest friends and allies.”

About 60% of U.S. crude oil imports are from Canada, and 85% of U.S. electricity imports as well.

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Lee noted Ontario powered 1.5 million homes in the U.S. in 2023 and is a major exporter of electricity to Michigan, Minnesota and New York.

Trump’s transition team did not immediately respond to a request for comment on the threat.

Canada is also the largest foreign supplier of steel, aluminum and uranium to the U.S. and has 34 critical minerals and metals that the Pentagon is eager for and investing for national security.