President Donald Trump’s new trade levies against China, Canada and Mexico include a broadside against e-commerce, with apparent plans to extinguish a long-held tariff exemption for packages worth less than $800.
Trump’s executive orders directing 25 percent levies on Canada and Mexico — plus a 10 percent duty on China — specify that the “de minimis” exemption for small packages no longer applies. Under the exemption, products below that dollar amount are able to enter the US…

