**Section 232 national security tariffs on copper and derivatives have expanded through presidential proclamations since August 2025, initially applying duties to semi-finished copper products and copper-intensive items like cables on a content basis before shifting in April 2026 to full customs value rates of 50% or 25% for covered articles.** A June 1, 2026 proclamation further modified coverage and rates for certain derivatives and equipment through 2027, including temporary reductions for qualifying agricultural and HVAC products and adjustments to U.S. content thresholds and USMCA treatment. Trader consensus reflected in current pricing assigns low probability to the specific HTSUS statistical line 8544.49.3040 facing new Section 232 duties by end-2026, with moderately higher odds by end-2027, amid an ongoing Commerce inclusions process and August 2026 proposals to add categories such as certain electric conductor cables. Resolution depends on future proclamations, Federal Register actions, or congressional measures under Section 232 authority that fully encompass the line, independent of other tariff regimes.