Abstract
The role ofnational parliaments in the European Union is not limited to developed especially in nineties and later forms of their participation in the consultation process by creation ofEuropean law. Successful functioning ofthe European Union depends also on the loyal fulfillment of obligations laid on member states that are coming from the Treaties. Although the area ofactivity of national parliaments has shrunken they received new functions related to the European integration.
The tuming point for the recognition of the role of national parliaments inEuropean Union took place in the Protocol to Amsterdam Treaty. It brought guaranties for fair conditions for parliaments to influence govemmental decisions conceming the European Union. It also institutionalized the COSAC - Conference of European Commissions of National Parliaments, as advisory body within the European Union structure. As the practice showed the first part ofthe Protocol had bigger influence on so far modest re-parliamentization ofthe European Union. Its deepening could take place together with coming into force of the Treaty establishing the Constitution for Europe. The Treaty could introduce a system of early waming by national parliaments against a violation of principle of subsidiarity. The introduction of the system without a ratification of the Constitutional Treaty seems to be possible but problematic.
