WASHINGTON — Donald Trump has identified what he sees as an all-purpose fix for what ails America: Slap huge new tariffs on foreign goods entering the United States. The former president and current Republican nominee asserts that tariffs — basically import taxes — will create more factory jobs, shrink the federal deficit, lower food prices and allow the government to subsidize childcare. He even says tariffs can promote world peace. “Tariffs are the greatest thing ever invented,’’ Trump said this month in Flint, Michigan. As president, Trump imposed tariffs with a flourish — targeting imported solar panels, steel, aluminum and pretty much everything from China. “Tariff Man,” he called himself. This time, he’s gone much further: He has proposed a 60% tariff on goods from China — and a tariff of up to 20% on everything else the United States imports. This week, he raised the ante still higher.