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Separation of powers under the United States Constitution

Separation of powers is a political doctrine originating in the writings of Charles de Secondat, Baron de Montesquieu in The Spirit of the Laws, in which he argued for a constitutional government with three separate branches, each of which would have defined abilities to check the powers of the others. This philosophy heavily influenced the drafting of the United States Constitution, according to which the Legislative, Executive, and Judicial branches of the United States government are kept distinct in order to prevent abuse of power. The American form of separation of powers is associated with a system of checks and balances.

This article is about the separation of powers specifically in the United States. For the theory of separation of powers, see separation of powers.

During the Age of Enlightenment, philosophers such as Montesquieu advocated the principle in their writings, whereas others, such as Thomas Hobbes, strongly opposed it. Montesquieu was one of the foremost supporters of separating the legislature, the executive, and the judiciary. His writings considerably influenced the Founding Fathers of the United States, such as Alexander Hamilton and James Madison, who participated in the Constitutional Convention of 1787 which drafted the Constitution.


Some U.S. states did not observe a strict separation of powers in the 18th century. In New Jersey, the governor also functioned as a member of the state's highest court and as the presiding officer of one house of the New Jersey Legislature. The president of Delaware was a member of the Court of Appeals; the presiding officers of the two houses of the state legislature also served in the executive department as vice presidents. In both Delaware and Pennsylvania, members of the executive council served at the same time as judges. On the other hand, many southern states explicitly required separation of powers. Maryland, Virginia, North Carolina and Georgia all kept the branches of government "separate and distinct."

Views on separation of powers[edit]

Many political scientists believe that separation of powers is a decisive factor in what they see as a limited degree of American exceptionalism. In particular, John W. Kingdon made this argument, claiming that separation of powers contributed to the development of a unique political structure in the United States. He attributes the unusually large number of interest groups active in the United States, in part, to the separation of powers; it gives groups more places to try to influence, and creates more potential group activity. He also cites its complexity as one of the reasons for lower citizen participation.

Judicial independence[edit]

Separation of powers has again become a current issue of some controversy concerning debates about judicial independence and political efforts to increase the accountability of judges for the quality of their work, avoiding conflicts of interest, and charges that some judges allegedly disregard procedural rules, statutes, and higher court precedents.


Many legislators hold the view that separation of powers means that powers are shared among different branches; no one branch may act unilaterally on issues (other than perhaps minor questions), but must obtain some form of agreement across branches. That is, it is argued that "checks and balances" apply to the Judicial branch as well as to the other branches—for example, in the regulation of attorneys and judges, and the establishment by Congress of rules for the conduct of federal courts, and by state legislatures for state courts. Although in practice these matters are delegated to the Supreme Court, the Congress holds these powers and delegates them to the Supreme Court only for convenience in light of the Supreme Court's expertise, but can withdraw that delegation at any time.


On the other side of this debate, many judges hold the view that separation of powers means that the Judiciary is independent and untouchable within the judicial sphere. In this view, separation of powers means that the Judiciary alone holds all powers relative to the judicial function and that the Legislative and Executive branches may not interfere in any aspect of the Judicial branch. An example of the second view at the state level is found in the Florida Supreme Court holding that only the Florida Supreme Court may license and regulate attorneys appearing before the courts of Florida, and only the Florida Supreme Court may set rules for procedures in the Florida courts. The State of New Hampshire also follows this system.

Constitution of the Roman Republic

Commander-in-Chief

Fourth branch of government

Signing statement

The Imperial Presidency

Unitary executive theory

at Wikisource

United States Constitution