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The Court of International Trade (Judge Restani) published an opinion on April 17, 2026 in POSCO v. United States, docketed under 28 U.S.C. § 1581(c), which confers CIT jurisdiction to review antidumping and countervailing duty determinations. POSCO is South Korea's principal integrated steel producer; this case challenges a Commerce Department AD/CVD determination affecting Korean steel imports into the United States. The published opinion represents a judicial check on the executive branch's trade remedy administration.
The April 17, 2026 opinion is the proximate event, representing the court's resolution of POSCO's challenge to a specific Commerce AD/CVD determination. The structural driver is the routine Section 1581(c) review cycle, through which major respondents like POSCO routinely contest margin calculations and methodology at the CIT after exhausting agency-level processes.
Domestic steel producers and their congressional backers, particularly the domestic integrated steel coalition, rely on robust AD/CVD margin levels as a core industrial policy tool and will pressure Commerce to defend adverse rulings on appeal. POSCO and Korean trade counsel represent the cross-pressure, seeking margin reduction through procedural and methodological arguments. The Biden and Trump administrations both maintained strong institutional support for AD/CVD enforcement, giving the underlying order high political durability regardless of the outcome of this particular judicial review.
South Korea is a major exporter of HS Chapter 72 steel products to the United States and has been subject to multiple AD/CVD orders over successive review cycles. A favorable ruling for POSCO would reduce the effective duty rate on Korean steel exports, creating competitive displacement risk for US domestic producers. WTO exposure is limited because the US AD/CVD framework, when applied within statutory bounds, is generally WTO-consistent, though individual margin methodologies are occasionally challenged at the WTO dispute settlement level.