How executive orders work
Presidents can reshape federal policy without a single congressional vote. Executive orders are the primary mechanism, and among the most misunderstood powers in American government.
What they are
Executive orders are directives issued by the President to federal agencies and employees. They are not laws. They have the force of law within the executive branch -- agencies must follow them -- but they cannot override a statute passed by Congress or a right protected by the Constitution. Think of them as the President's internal management instructions for the government he or she runs.
Where the authority comes from
Presidents issue executive orders under Article II of the Constitution, which vests executive power in the President and directs the President to "take care that the laws be faithfully executed." Most orders also cite specific statutory authority -- laws passed by Congress that grant the executive branch discretion in a particular area. A well-drafted executive order typically cites both constitutional and statutory bases. An order that lacks statutory grounding and stretches constitutional authority is vulnerable in court.
What they can and cannot do
Executive orders can direct agencies to prioritize certain enforcement actions, set policy for the federal workforce, reorganize executive offices, govern federal contracting, and manage how the government implements existing laws. They cannot appropriate money -- that power belongs to Congress alone. They cannot override a federal statute. They cannot override constitutional rights. When presidents have tested these limits, courts have struck the orders down. President Truman's attempt to seize steel mills during the Korean War via executive order was rejected by the Supreme Court in 1952.
History
Every president since George Washington has issued executive orders, though they were not formally numbered until 1907. Franklin Roosevelt issued the most of any president: 3,721, many during the Depression and World War II. Some of the most consequential orders in American history include Lincoln's Emancipation Proclamation, Roosevelt's Japanese American internment order (widely condemned as unconstitutional in hindsight), Truman's desegregation of the military, and Kennedy's creation of the Peace Corps. The practice of governing aggressively by executive order has accelerated across administrations of both parties.
Reversal
The most significant limitation of an executive order is its impermanence. A new president can revoke a predecessor's order with a new order of their own, on the first day in office if desired, with no congressional action required. This is exactly what has happened in recent transitions: incoming presidents have revoked dozens of their predecessors' orders in the opening days of their administrations. Policies built on executive orders can be undone as quickly as they were created.
The difference from law
A federal law requires passage by both chambers of Congress and the President's signature -- or enough votes in both chambers to override a veto. It can only be changed by repealing or amending it through the same process. An executive order requires only the President's signature, and it can be undone by the next President alone. This distinction matters enormously for policy durability. Programs built on legislation survive changes in administration. Programs built on executive orders may not.