The constitutional amendments of 2017 have determined the constitutional principles governing the presidential decree which grants the executive the power to regulate in social, political and administrative spheres. The President, who is the sole constituent of the executive branch, will be able to regulate on social and economic rights and on the organisation and functioning of the administration, directly on basis of the power deriving from the Constitution, without any legal basis. The scope and boundaries of this new type of power, lying at the intersection of constitutional and administrative law, must be drawn. Even though existing structures and considerations provide indications, issues to be regulated by a genuine tool such as the presidential decree and their compliance with the Constitution, shall be evaluated in accordance with the constitutional principles as a whole and the new political system. One of the basic argument of this article is that the presidential decree does not create an exclusive/reserved regulatory sphere for the executive power, but is limited to primary regulative power as the plenary regulatory power of the legislative is preserved.