The international parliamentary legislative process is a pillar of democratic practice of the vast majority of the national States of twenty-first century, ensuring a legitimate participation between different actors. Although bound within national constitutions, there is no such category in the international arena. The growing importance of international law in bilateral and multilateral relations raises the question of democratic legitimacy of the creation of these laws. The international context, however, engenders and promulgates rules through a series of acts, with the limited democratic form of international legal processes, which creates a democratic deficit to which the answers would be a parliamentary diplomacy. This concept retrieves both the emergence of new transnational parliamentary, and also the performance of national parliamentarians in international affairs. Parliamentary diplomacy can represent such agents that initiate a process of internationalization of the legislative constitutional corporations. For the pragmatic understanding of the case will be analyzed the cases of the illegally return of third-country nationals directive approved by European Parliament and the Protocol of Accession of Venezuela to Mercosur. Both will be studied by analyzing the activity of parliamentary diplomacy, and a conceptual constructivist argument that favors democratic evolution through the transconstitucionalism method.
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