Supreme Court ruling curbs executive trade powers as new tariff threats emerge
Washington, Saturday 21 February 2026
On 20 February 2026, the US Supreme Court delivered a significant blow to President Trump’s protectionist agenda, ruling 6-3 that his use of the International Emergency Economic Powers Act to impose global tariffs exceeded executive authority. While Chief Justice Roberts’ opinion reasserts the judiciary’s role in checking presidential power—a move welcomed by French President Emmanuel Macron as a victory for democratic counterweights—the economic landscape remains volatile. In a swift retaliatory manoeuvre, President Trump has already signed a decree for a fresh 10 per cent universal import tariff, set to take effect on 24 February, invoking the Trade Act of 1974. Consequently, while the Benelux semiconductor and deep tech sectors enjoy a momentary legal reprieve, the transatlantic trade environment faces renewed instability. Investors must now navigate this constitutional tug-of-war, as the administration pivots to alternative statutory mechanisms to maintain trade barriers.
Judicial Checks and Executive Pivots
The Supreme Court’s decision, underpinned by Chief Justice John Roberts’ assertion that the International Emergency Economic Powers Act (IEEPA) does not grant the power to impose tariffs, was a distinct rebuke of executive overreach [1]. Yet, the respite was short-lived. President Trump, labelling the justices “fools” and “lapdogs” [1], immediately pivoted to Section 122 of the Trade Act of 1974 [4]. This statutory shift allows for a base tariff of up to 15 per cent for a maximum of 150 days [4], a mechanism he has invoked to implement a 10 per cent global tariff effective from 24 February [4]. While the Court successfully policed the scope of power delegated by Congress under the IEEPA [1], the administration’s swift utilisation of an alternative “newer vintage” of statute [1] demonstrates the fluidity of US trade policy.
The Arithmetic of Uncertainty
Financially, the judicial intervention initially promised a significant de-escalation in trade costs. Global Trade Alert estimated that the Supreme Court ruling would slash the trade-weighted average US tariff by nearly half, dropping from 15.4 per cent to 8.3 per cent [3]—a reduction of -46.104 per cent. However, the administration’s rapid counter-move to introduce a 10 per cent blanket import duty [4] complicates this calculus. While the new decree includes exemptions for medicines and “certain critical minerals” [4], the broad application of the tariff creates a complex environment for exporters who must now adjust to a new baseline levy mere days after the previous regime was struck down.
Implications for the Semiconductor Value Chain
For the European semiconductor value chain—a critical pillar of the region’s strategic autonomy—the regulatory oscillation presents a mixed picture. Under the trade agreement finalised in July 2025, semiconductors were explicitly subject to a 15 per cent tariff [4]. Jan Van Hove, a professor of international economy, notes that Trump’s new 10 per cent global tariff effectively replaces this previously agreed 15 per cent rate [4]. While this technically lowers the barrier for chip exports compared to the prior deal, the volatility of the legal basis creates uncertainty for long-term planning. Crucially, the new decree exempts “certain critical minerals” [4], a vital concession that may safeguard the raw material inputs necessary for integrated photonics and chip manufacturing equipment.
European Strategic Autonomy and Response
The European response has been swift, emphasising resilience over retaliation. French President Emmanuel Macron hailed the court’s decision as a demonstration of the “counterweights to power” essential in democracies, while advocating for “reciprocity” rather than unilateralism [2]. Meanwhile, French Minister of Trade Nicolas Forissier has indicated that the EU possesses the necessary tools to respond, specifically pointing to the Anti-Coercion Instrument—dubbed the “trade bazooka”—which permits retaliatory levies or the exclusion of US companies from European tenders [4]. As Pieter Timmermans of the VBO advises, companies must “beware of the calm” [4], suggesting that despite the judicial victory, the transatlantic trade war has merely entered a new, more litigious phase.