This graduation thesis deals with the constitutional powers of the President of the Republic of Croatia. At the beginning, it talks about the constitutional powers of the President of the Republic of Croatia, which are guaranteed to him by the Constitution of the Republic of Croatia from 1990. After that, there is talk about reduction of the constitutional powers of the President of the Republic of Croatia, which were brought about by amendments to the Constitution in 2000. Furthermore, it talks about the concept of cohabitation, which entered Croatian political life after the constitutional changes in 2000, and about the different forms of cohabitation that occurred between the President of the Republic of Croatia and (the President of) the Government of the Republic of Croatia over the past twenty years. The largest part of this graduation thesis deals with the analysis of the Decision of the Constitutional Court. This Decision does not accept the proposal to start the procedure for the assessment of compliance with the Constitution of Article 44.a of the Law on Courts. The majority of the judges of the Constitutional Court made such a decision, and later some of the judges further clarified this position in supporting separate opinions. On the other hand, judges who voted differently from the majority also present their dissenting separate opinions. This graduation thesis also discusses the impact of the Report of „The Group of States against Corruption“ (GRECO) on the adoption of the disputed legal provision 44.a of the Law on Courts. As the main question of the central part of this thesis, it stands out: whether the constitutional provision, which does not contain the phrase „in accordance with the law“, can be further elaborated by law.