This chapter analyses the manner in which the EU and Canadian parliaments shape their involvement in the bilateral strategic partnership. The analysis examines their respective constitutional powers for international parliamentary action, both through the conclusion of international agreements and through informal channels of interparliamentary cooperation in EU–Canada relations. To this end, the chapter assesses the mechanisms for political dialogue, consultation and regulatory cooperation foreseen in the Strategic Partnership Agreement and the Comprehensive Economic and Trade Agreement (CETA). Furthermore, the chapter investigates the parliamentary scrutiny of CETA in order to determine the manner and level of parliamentary involvement in the strategic partnership. The chapter inquires whether the parliaments’ approach to foreign and trade policy making is determined by the nature of their constitutional powers in the international sphere and whether parliamentary diplomacy, in the form of transnational interparliamentary dialogue, is a desirable and viable tool for overseeing and counterbalancing intergovernmental diplomacy.