EN
The EU treaty law distinguishes competences between the EU and its Member States. The scope of EU competence is constantly growing. The governments of the Member States wanted to ensure their decisions in matters of security. However, this area of international affairs is beginning to be dominated by EU institutions. It causes problems and conflicts of competence. An example is the issue of the allocation of immigrants between EU Member States and various concepts of the new EU external border security system. The division of these competencies should therefore be determined precisely. The lack of these regulations weakens the EU’s integrity and threatens to break it down. This hypothesis is confirmed by Brexit and the current political and social situation in several EU countries. e.g. in Poland and Hungary. The purpose of the article is to indicate the current legal status and postulates de lege ferenda of acquis communautaire.