Ontario Premier Doug Ford said Thursday he's dead serious about withholding energy exports to the U.S. if president-elect Donald Trump goes ahead with his plan to hit Canadian goods with steep tariffs that could cripple the economy.

Premier Doug Ford says that cutting off the energy supply to the U.S. remains a “last resort” amid the threat of a promised 25 per cent tariff on Canadian goods but he is warning that his government is ultimately prepared to use “every tool” in its toolbox “to protect the livelihoods of the people of Ontario.

Canada’s most populous province has no plans to go gentle into that good night if Donald Trump follows through on his threat to impose massive tariffs on Canadian goods. Ontario Premier Doug Ford said his province was putting together a list of retaliatory measures and would go so far as to cut off energy exports to the U.