Tariffs are taxes on imported goods. They are a sales tax that the buyers/ US consumers and business must pay. So when the President raises taxes on Chinese goods; he is adding 10% and now 25% to the costs of goods made in China. He also may be raising the prices of goods made in America by indirection as the domestic manufacturers have fewer competitors and are thus able to raise their prices. The same applies to foreign steel and aluminum, to foreign made cars, to washing machines and solar panels.