In the United States, the principle of separation of powers is constitutional. The Constitution restricts each of three branches of state power, providing for a system of checks and balances between them. This principle is realized due to various sources of the formation of branches of power and a system of overlapping powers. For example, the president may recommend certain laws and veto laws enacted by Congress, as well as appoint officials in the federal judicial system. The Supreme Court may recognize the laws adopted by the Congress, as well as the decisions of the president, as contradicting the constitution; in turn, the Congress may not approve appointments to the executive bodies of power, reject international treaties, overcome the president’s veto, and impeach the president and members of the Supreme Court.
For the reliable protection of society from the danger of establishing tyranny, power had to be distributed among branches of government. At the same time, it must be immediately emphasized that the founders of the US Constitution never thought of creating three completely independent authorities, i.e., of the creation of a certain kind of tri-power, which is possible only in theory. In addition, it was intended to create a system of interdependence that provides mutual control in order to prevent abuse.
An analysis of the text of the US Constitution, its numerous comments and interpretations leads to the conclusion that the Constitution does not refer to the classical separation. Power as such is assumed to be unified; only responsibilities are delimited. The unity of power is derived from the concept of unified sovereignty.