Following a sharp deterioration in relations, Canada is set to announce retaliatory tariffs against the United States on Tuesday. The move comes after President Donald Trump urged Canadian leaders to "fall in line" or face consequences "far worse" than existing tariffs, while accusing Washington of trying to subordinate Canada. Finance Minister François-Philippe Champagne and three other Cabinet ministers are expected to provide details about supports for workers affected by the tariffs. Prime Minister Mark Carney has indicated that Canada may move away from matching U.S. tariffs dollar for dollar, instead focusing on more targeted retaliation to protect Canadian workers and businesses. The trade dispute threatens to disrupt one of the world's largest trading relationships, with deeply integrated supply chains across automotive, energy, agriculture, and manufacturing. Tensions between the two nations have escalated since Carney walked away from trade negotiations with the Trump administration late last week, triggering threatened 50% tariffs on about $20 billion worth of Canadian goods. While both sides have exchanged heated words, Ontario Premier Doug Ford has vowed to take "everything on the table" if the dispute worsens, including cutting off electricity and critical minerals from Ontario, which are increasingly important to U.S. national security and manufacturing. The Pentagon has sought more secure supplies of minerals used in military aircraft, missiles, munitions, and electronics as Washington tries to reduce reliance on China, which dominates the mining or processing of several strategically important minerals.