BusinessA proclamation signed late Monday by U.S. President Donald Trump will amend his ‌Sec. 232 national security tariffs on some aluminum, steel and copper imports, lowering them from 25 per cent to 15 per cent.Effective June 8, tariffs on some steel, aluminum derivatives will go from 25% to 15%Thomson Reuters · Posted: Jun 02, 2026 8:50 AM EDT | Last Updated: 2 hours agoListen to this articleEstimated 2 minutesThe audio version of this article is generated by AI-based technology. Mispronunciations can occur. We are working with our partners to continually review and improve the results.U.S. President Donald Trump points his finger during a cabinet meeting in the Cabinet Room at the White House, in Washington, D.C., U.S., May 27, 2026. The president issued a proclamation late Monday lowering tariffs on some steel, aluminum and copper derivative products. (Evan Vucci/Reuters)U.S. President Donald Trump on Monday signed a proclamation to amend his ‌Sect. 232 national security tariffs on some aluminum, steel and copper imports, the White House said.Effective June 8, tariffs on some ​steel and aluminum derivative products, including ​certain types of agricultural machinery and residential heating, air conditioning and ventilation equipment, will be lowered from 25 per cent to 15 per cent.The order says mobile industrial ⁠equipment, such ⁠as bulldozers and forklifts, ‌will be subject to a 15 per cent tariff "when imported from trade deal countries that are entitled to such treatment," the White House said in a statement.WATCH | Ottawa announces $1.5B to support aluminum, steel industries:Ottawa announces $1.5B to support aluminum, steel industriesMay 4|Duration 2:03The federal government announced a $1.5 billion package to help industries hit hard by U.S. tariffs on steel, aluminium and copper, but the deal has other sectors looking for support.The order will also allow foreign companies to qualify for a 10 per cent tariff if "their capital equipment includes at ‌least 85 per cent U.S. melted and poured or smelted and cast steel or aluminum by weight."Two new categories of steel ​and aluminum derivative import products will be subject to ⁠25 per cent duties: steel racks and aluminum lithographic plates.The ⁠adjustments will become effective for goods imported or withdrawn ⁠from ⁠bonded warehouses ​after 12:01 a.m. ET on June 8.The changes ​will remain ⁠in place until Dec. 31, 2027, "to spur near–term investments that will rebuild the Nation’s industrial base," the White House said.