Separation of Powers
Separation of powers is the constitutional division of legislative, executive, and judicial powers among distinct government institutions to prevent concentrated political power.
Government requires power. But political power becomes especially dangerous when the same person or institution possesses authority to make laws, enforce them, and judge disputes arising under them.
The separation of powers addresses this danger by dividing different kinds of governmental power among different institutions.
The United States Constitution establishes this structure directly.
- Article I vests “all legislative Powers herein granted” in Congress and define Congress, “which shall consist of a Senate and House of Representatives.”
- Article II vests executive power in the President.
- Article III vests judicial power in the federal courts.
This connects Separation of Powers directly to the Key Ideas Constitution, Power, Rule of Law, Liberty, and Responsibility.
Three Different Powers
The three basic governmental powers perform different functions.
Legislative power makes laws.
Executive power executes and enforces laws.
Judicial power resolves cases and controversies arising under the Constitution and laws and determines how law applies in particular disputes. Article III expressly extends federal judicial power to cases arising under the Constitution and federal laws.
Dividing these powers helps prevent any single institution from controlling the entire process of governing. Imagine a government in which the same officials could write a law directed against you, accuse you of violating it, enforce the accusation, and then sit in judgment of your case.
The danger is obvious.
Concentrated Power and Tyranny
James Madison explained the principle in Federalist No. 47: “The accumulation of all powers, legislative, executive, and judiciary, in the same hands” may justly be called “the very definition of tyranny.”
The problem is not merely that concentrated government might operate inefficiently or make mistakes. The deeper problem is that concentrated power removes important institutional barriers between the government and the citizen.
An institution that makes laws is less dangerous when a different institution must enforce them and an independent judiciary may determine, in cases properly before it, whether the law or its enforcement is constitutional. Dividing power makes arbitrary power more difficult to exercise.
Separation Does Not Mean Complete Isolation
The Constitution does not place the three branches inside completely sealed compartments. Congress passes legislation, but the President may veto it. Congress may override a presidential veto by the constitutionally required supermajorities. The President nominates federal judges, but appointments require Senate confirmation. Courts decide cases involving laws enacted by Congress and actions taken by executive officials.
The branches are therefore separate but interconnected.
Madison explained in Federalist No. 47 that separation of powers does not require that the branches have absolutely no participation in or influence over one another. The constitutional concern is the concentration of the whole power of one department in the same hands that possess the whole power of another.
Separation of Powers and Checks and Balances
This leads to an important distinction. Separation of powers divides governmental authority. Checks and balances give the separate institutions ways to resist one another’s encroachments.
In Federalist No. 51, Madison explained that merely drawing boundaries on paper would not be enough. Each department needed constitutional means and motives to defend its own authority against the others.
His famous formulation was: “Ambition must be made to counteract ambition.” The constitutional design therefore does not assume that everyone who holds office will always exercise power wisely or virtuously.
Instead, it attempts to arrange institutions so that political power encounters political power.
Separation and Accountability
Dividing powers can also make political Responsibility clearer.
Congress bears responsibility for legislation. The President bears responsibility for exercising executive power. Courts bear responsibility for deciding cases within their jurisdiction.
When different powers become blurred together, responsibility can become harder to identify. Citizens may struggle to determine who actually made a consequential decision and who should answer for it.
Clear divisions of authority therefore help citizens ask a fundamental question: Who possessed the power to do this?
That question is essential to constitutional accountability.
Separation of Powers and Liberty
The ultimate purpose of separating powers is not to protect the institutional pride of Congress, presidents, or judges. It is to prevent governmental power from becoming concentrated in one set of hands.
Separation of powers can make government slower and sometimes less efficient. That is not necessarily a defect.
A government capable of acting instantly through the unchecked will of a single person may be extremely efficient. Constitutional government deliberately places obstacles in the path of political power because speed and efficiency are not the highest political goods.
Liberty sometimes depends upon making government power difficult to concentrate and difficult to abuse.
Why Separation of Powers Matters
Separation of powers begins from a realistic insight: human beings entrusted with political power may misuse it.
The constitutional solution is not to eliminate government power, which government requires in order to perform its proper functions. Nor is it sufficient simply to hope that virtuous people will always hold office. As Madison warned in Federalist No. 10, “Enlightened statesmen will not always be at the helm.”
The solution is to divide political power institutionally. Legislators make laws. Executives enforce them. Courts adjudicate legal disputes. Checks and balances then give these separate institutions means to resist encroachments upon their constitutional authority, putting teeth into the separation of powers.
