Résumé : The PhD dissertation studies the construction of trade protection in the United States and the European Union. It focuses in particular on measures of contingent protection, comprising anti-dumping duties, countervailing duties and safeguards. The dissertation adopts a constructivist approach based on narrative analysis: broadening the conventional scope of political economy research on trade, the analysis combines the study of narratives with the concept of ‘discourse coalition’. The period under investigation spans over the period 2010-2014, covering the Obama Administration and the mandate of European Commissioner for trade Karel De Gucht. Adopting a comparative approach of the US and EU trade policy, the dissertation provides a detailed analysis of the US administration’s and the European Commission’s discourses on trade protection, and includes an analysis of a large array of other actors’ alternative, or competing constructions of contingent protection. The dissertation demonstrates that a specific type of unilateral enforcement plays an underestimated role in the construction of contingent protection. It also emphasizes that policy actors consider contingent protection as necessary to convince people that the trading system is fair; the research proposes the concept of ‘discursive embedded liberalism’ to account for this specific construction of trade protection. The research underlines elements of continuity and change, showing that many elements of the current crisis within the international trade regime were already in the making in the period under investigation.