US President Donald Trump has introduced a fresh set of tariff adjustments that reduce import duties on selected agricultural and industrial machinery while promoting greater reliance on metals produced within the United States.
White House officials said the decision seeks to balance industrial growth with national security objectives.
The revised policy alters existing Section 232 measures, which the administration uses to protect strategic industries and reinforce the country's manufacturing base.
Under the new proclamation, import duties on various agricultural machines, including harvesters and combines, will decrease from 25 per cent to 15 per cent by the end of 2027.
The administration introduced the tariff reduction to lower costs for industries that rely on specialised equipment and to encourage greater investment in production activities.
The administration has also expanded eligibility for the reduced tariff rate to cover additional industrial products.
Equipment such as bulldozers, forklifts, and other mobile industrial machines imported from partner nations under trade agreements will now benefit from the lower duty structure.
In a statement accompanying the announcement, the White House said the updated framework would help counter national security risks, stimulate investment across multiple sectors, and support the expansion of domestic manufacturing capabilities.
The White House said the policy will drive growth in agriculture, housing construction, and industrial production while strengthening supply chains that support these sectors.
The administration has revised the criteria for imported products seeking tariff preferences based on domestic metal content.
Imported goods will now qualify if at least 85 per cent of their steel, aluminium, or copper content originates in the United States, compared with the previous requirement of 95 per cent.
According to the White House, the change is expected to increase demand for American-produced metals and encourage manufacturers to incorporate more domestic materials into finished products.
The proclamation also extends tariff coverage to aluminium lithographic plates and steel racks, a move officials say will prevent loopholes in existing trade measures.
It noted that the United States ranked as the world's third-largest steel producer in 2025 and highlighted several new investment projects in steel, aluminium, and copper production across the country.
Officials said the updated tariff framework aims to support farmers, manufacturers, and industrial businesses while reinforcing the long-term competitiveness of strategic American industries.