The 25 percent tariffs on imported steel and aluminum are the latest salvo in his ongoing effort to overhaul the U.S. trading relationship with the rest of the world.

The Trump administration on Friday delayed the suspension of the so-called de minimis provision, which allows packages worth less than $800 to enter the country duty-free, a move that helps low-cost shopping sites from China that sell everything from fast fashion to furniture.

Steel and aluminum are heavily used in the automotive and construction industry, but are also used to manufacture goods and appliances. The decision mirrors the actions Trump levied during his first Administration, when he enacted a 25% tariff on steel and 10% tariff on aluminum, though some countries, including South Korea were exempt.