Canadian Prime Minister Justin Trudeau announced that Canada would respond with 25% tariffs "against $155 billion worth of American goods."

On Saturday, Trump signed an executive order imposing 25% tariffs on Mexico and Canada and a 10% hit on China. By midday Monday, Trump's 25% tariff on Canadian goods and a 10% tariff on Chinese goods still appeared on course to begin Tuesday. Here is what to know about Trump's tariff plan and how it affects the prices of goods.