Trump Signs Proclamation to Adjust Tariffs on Aluminum, Steel, and Copper Imports

President Donald Trump signs an executive order in the Oval Office of the White House on April 30, 2026. Andrew Harnik/Getty ImagesPresident Donald Trump signed a proclamation on June 1 to amend tariffs on aluminum, steel, and copper imports in an effort to boost investment in the U.S. agriculture and manufacturing sectors.The proclamation will lower tariffs on agricultural equipment, including combines and harvesters, from 25 percent to 15 percent, and expand the category of industrial equipment that is subject to a 15 percent tariff.