The system of checks and balances between Congress and the President is the constitutional arrangement that forces the two branches to share power over lawmaking, spending, appointments, foreign affairs, and the use of force. Article I gives Congress the authority to write laws, control federal money, and confirm or remove officials. Article II gives the President the authority to execute those laws, command the armed forces, negotiate with foreign governments, and nominate the people who run the government. Neither side can do much alone, and that is the point.
Making Laws: The Veto and the Override
Every federal law starts in Congress, but the President gets the final word before a bill takes effect. Article I, Section 7 requires that any bill passed by both chambers be sent to the President, who has ten days (Sundays excluded) to sign it or return it with written objections.1Congress.gov. Article I Section 7 – Legislation
A returned bill is a regular veto. Congress can override it only if both chambers pass the bill again by a two-thirds supermajority. In a legislature where party-line votes are the norm, that bipartisan margin is rare, so most vetoes stick. The threat alone gives the President significant leverage over what goes into a bill in the first place.1Congress.gov. Article I Section 7 – Legislation
A pocket veto works differently. If Congress adjourns before the ten-day window expires, the President can do nothing and the bill dies. There is no chamber in session to hold an override vote.2Congress.gov. Regular Vetoes and Pocket Vetoes: In Brief The mirror rule also applies: if Congress stays in session and the President ignores the bill for ten days, it becomes law without a signature.
The veto works on whole bills, not parts of them. Congress tried to give the President line-item veto power in 1996, but the Supreme Court struck the law down in Clinton v. City of New York, holding that the Constitution requires the President to accept or reject a bill as a single document.3Library of Congress. Clinton v. City of New York, 524 U.S. 417 (1998) The same logic runs the other way. In INS v. Chadha, the Court held that Congress cannot reverse an executive action by a one-chamber or one-committee “legislative veto.” To undo an executive action by law, Congress must pass a bill through both chambers and present it to the President.4Justia US Supreme Court. INS v. Chadha, 462 U.S. 919 (1983)
Executive Orders and What Congress Can Do About Them
Presidents do not always wait for Congress. Executive orders let the President direct federal agencies and set policy, drawing on either Article II authority or powers Congress has already delegated by statute.5Congress.gov. Executive Orders: An Introduction Every administration uses them.
Congress has several ways to push back. It can pass a law reversing the order, though that law itself needs a signature or a veto-proof majority. It can defund the order by forbidding any appropriated dollars from being used to carry it out, which has historically been one of the most effective checks. In some cases Congress has revoked specific orders by statute.5Congress.gov. Executive Orders: An Introduction Federal courts add another layer: an order that exceeds constitutional or statutory authority can be challenged and struck down. The practical result is that executive orders are strong in the short term and fragile over the long term. A new president can revoke a predecessor’s orders on day one.
Appointments and Senate Confirmation
The President picks the people who run the federal government. The Senate decides whether those picks take office. Article II, Section 2 gives the President the power to nominate Cabinet secretaries, federal judges, Supreme Court justices, and ambassadors, and none of them are seated until the Senate confirms them.6Congress.gov. Article II Section 2 Clause 2
Confirmation begins in the relevant committee (Judiciary for judges, Foreign Relations for ambassadors, and so on). The committee holds hearings, questions the nominee, and votes on whether to send the nomination to the floor, where a simple majority confirms.
The Constitution distinguishes between “principal officers,” who need Senate confirmation, and “inferior officers,” whose appointment Congress may assign to the President alone, to department heads, or to the courts.7Congress.gov. Overview of Appointments Clause That split keeps the Senate focused on the most consequential positions and lets thousands of lower-level roles fill without a hearing each time.
Recess Appointments
When the Senate is in recess, the President can temporarily fill vacancies without confirmation. These recess appointments expire at the end of the Senate’s next session. The Supreme Court has held that recesses shorter than ten days are presumptively too brief to trigger the power, and the Senate can block recess appointments by holding brief pro forma sessions every few days to avoid an official recess.8Cornell Law Institute. Recess Appointments Power: Overview
Treaties, Trade, and War Powers
The friction between the branches is loudest in foreign affairs. The President negotiates treaties, but a treaty is not binding until two-thirds of the senators present vote to approve it.9United States Senate. About Treaties That is a higher bar than ordinary legislation.
Presidents often bypass the treaty process through executive agreements with foreign leaders. Those do not need Senate approval, which makes them faster. The trade-off is durability: a later president can withdraw from an executive agreement unilaterally, while a ratified treaty carries the weight of federal law.
Trade deals sit in between. Under Trade Promotion Authority (fast-track authority), Congress agrees in advance to vote on trade agreements under special rules: no amendments, no filibuster, a guaranteed up-or-down vote within 90 days, and no more than 20 hours of floor debate in each chamber. Foreign governments know Congress cannot rewrite the deal after signing, which strengthens the President’s hand at the table. Trade Promotion Authority most recently expired in 2021 and has not been renewed.
War Powers
The Constitution makes the President Commander in Chief but gives Congress the exclusive power to declare war. In practice, presidents have committed troops to combat many times without a formal declaration. The War Powers Resolution of 1973 tried to reassert congressional authority. It requires the President to notify Congress in writing within 48 hours of sending armed forces into hostilities or into situations where hostilities are imminent.10Office of the Law Revision Counsel. 50 USC 1543 – Reporting Requirement
The resolution also imposes a 60-day clock. If Congress does not declare war or pass a specific authorization within that window, the President must withdraw. An additional 30 days is available only if the President certifies in writing that the safety of the troops requires it during withdrawal.11Office of the Law Revision Counsel. 50 USC Chapter 33 – War Powers Resolution Every president since 1973 has questioned whether the resolution is constitutionally binding. None has formally defied it.
The Power of the Purse
Money is Congress’s strongest lever over the executive branch. The Constitution is blunt: “No Money shall be drawn from the Treasury, but in Consequence of Appropriations made by Law.”12Congress.gov. Article I Section 9 Clause 7 The President submits a budget request each year, but it is a wish list. Congress writes the appropriation bills that decide exactly how much each program and agency receives.
When the two branches cannot agree on spending before the fiscal year begins on October 1, the government shuts down. Federal agencies lose their legal authority to spend, non-emergency workers are furloughed, and services are disrupted. Continuing resolutions can keep funding at existing levels while negotiations continue.
Impoundment: Spending What Congress Approved
Presidents have sometimes tried to sidestep Congress’s spending power by refusing to spend money that was already appropriated. The Impoundment Control Act of 1974 closed that loophole. If the President wants to cancel funding (a rescission), the administration must send a special message to Congress and can withhold the money for no more than 45 days. If Congress does not pass a rescission bill within that window, the funds must be released.13Office of the Law Revision Counsel. 2 USC 683 – Rescission of Budget Authority
Temporary delays (deferrals) are allowed only for narrow reasons: preparing for contingencies, achieving savings through operational efficiencies, or where a specific law authorizes it. No deferral can extend past the end of the fiscal year.14U.S. GAO. Impoundment Control Act If the executive branch ignores these rules, the Comptroller General can file suit to force the release of funds.
National Emergency Powers
A presidential declaration of national emergency unlocks roughly 150 additional statutory powers that are not normally available, covering areas from military deployments to economic sanctions to domestic infrastructure controls. The National Emergencies Act of 1976 sets the ground rules. Each declaration must be published in the Federal Register and transmitted to Congress, and it automatically expires after one year unless the President formally renews it within 90 days before the anniversary.15Office of the Law Revision Counsel. 50 USC 1622 – National Emergencies
Congress can terminate any emergency by joint resolution, though that resolution needs a signature or a veto-proof majority like any other legislation. The act also requires each chamber to meet at least every six months to consider whether a declared emergency should continue.15Office of the Law Revision Counsel. 50 USC 1622 – National Emergencies In practice, many declarations are renewed quietly year after year with little debate.
Oversight and Executive Privilege
Passing laws and controlling money are only part of the check. Standing committees in both chambers investigate how the executive branch carries out its duties. They can compel testimony and documents through subpoena power, and hearings frequently surface waste, mismanagement, or policy failures.
The Government Accountability Office is Congress’s in-house auditor, investigating executive agencies and reporting back to the committees that request its work.16U.S. GAO. What GAO Does Its reports carry weight in budget fights and can trigger legislative action.
When Congress demands information the White House wants to keep confidential, the President may invoke executive privilege. The Supreme Court recognized the doctrine in United States v. Nixon, holding that a President has a constitutionally grounded interest in confidential internal deliberations so that advisers can speak candidly. The Court also held that the privilege is qualified, not absolute, and cannot override a specific, demonstrated need for evidence based only on a generalized claim of confidentiality.17Justia US Supreme Court. United States v. Nixon, 418 U.S. 683 (1974) The Supreme Court has never directly ruled on executive privilege in the specific context of a congressional investigation, so the boundaries remain uncertain.18Congress.gov. Overview of Executive Privilege Most disputes are resolved by negotiation, with court battles reserved for the hardest standoffs.
Impeachment
The sharpest check Congress holds is the power to remove a sitting president. The Constitution limits the grounds to treason, bribery, or other high crimes and misdemeanors, a standard set deliberately high to prevent removal over ordinary policy disagreements.19Congress.gov. Article II Section 4
The House of Representatives has the sole power of impeachment. A simple majority vote on one or more articles is enough to formally charge the President.20Congress.gov. Overview of Impeachment The case then moves to the Senate for trial. The Chief Justice of the United States presides, House members act as prosecutors, and a two-thirds vote of the senators present is required for conviction and removal.21Congress.gov. Article I Section 3
That two-thirds threshold has proved nearly impossible to reach. No president has ever been convicted and removed. The real weight of the process is that it exists, and it shapes presidential behavior alongside the daily pressure of oversight hearings, budget fights, and confirmation battles.