Canada’s prime minister and Mexico’s president ordered retaliatory tariffs on goods from the U.S, following through with their threats after U.S. Donald Trump sparked a trade war by imposing sweeping tariffs on imports from Canada,

Canada hopes hefty tariffs imposed by U.S. President Donald Trump will not take effect on Tuesday but the Canadian public expects the government to stand firm in a trade dispute with Washington, the Canadian ambassador told ABC News on Sunday.

Trump knows the United States has more leverage over its neighbors than they do over his country. But exploiting that position of strength could cause a historic rupture.