The article deals with the constitutional foundations of the cooperation between political power and court, the practical expression of the crossfunctional partnership from a legislative point of view. Rulings of the SACL, where the Constitution, the constitutional principles were directly applied and which were significant from a legislative point of view, are analysed, practical examples of problems in rulings of the Supreme Administrative Court of Lithuania, where it was bound by unclear provisions of rulings of the Constitutional Court, are revealed. The constitutional identity, the relationship of the European Union (hereinafter also referred to as the EU) and the Constitution of the Republic of Lithuania are analysed separately. The importance of cooperation between EU law and national legal systems is discussed.

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