Congress can check the power of the President through a set of constitutional and statutory tools: passing laws (and overriding vetoes), controlling federal spending, confirming or rejecting nominees, ratifying treaties, constraining military deployments, striking down agency rules, conducting oversight and issuing subpoenas, impeaching and removing the President, and deciding contested claims of presidential disability. Each tool works differently, and together they form the practical limits on what any president can actually do.
Passing Laws and Overriding Vetoes
Only Congress can create federal law. A bill that passes both the House and the Senate goes to the President, who can sign it or veto it. A veto sends the bill back to the chamber where it started along with the President’s written objections.1Legal Information Institute (LII). Presidential Approval or Veto of Bills
The veto is not the last word. If two-thirds of both chambers vote to pass the bill again, it becomes law over the President’s objection. The threshold is high, and overrides are rare, but the possibility shapes the negotiations that produce legislation in the first place.
One exception matters. If the President does nothing with a bill for ten days (Sundays excluded), it normally becomes law without a signature. But if Congress adjourns during that window and prevents the bill’s return, the bill dies. That is a pocket veto, and Congress cannot override it because the originating chamber is no longer in session to receive the bill back.1Legal Information Institute (LII). Presidential Approval or Veto of Bills The Supreme Court confirmed that reading in the 1929 Pocket Veto Case, focusing on whether adjournment made return impossible.2Justia U.S. Supreme Court Center. Pocket Veto Case Congress can blunt the tactic by timing adjournments carefully or designating agents to receive returned bills.
Controlling Federal Spending
No money leaves the federal treasury without an act of Congress. Article I, Section 9 requires that appropriations come through legislation, not executive decision.3Cornell Law Institute. Article I, Section 9, Clause 7 – Appropriations Clause The practical effect is enormous. A president can announce any initiative, but nothing happens without money. Congress can starve disfavored programs, fund preferred ones, and attach conditions to whatever it does approve.
Presidents have sometimes tried to work around this by refusing to spend money Congress already appropriated. The Congressional Budget and Impoundment Control Act of 1974 closed that door. A president who wants to cancel approved spending must send a rescission request to Congress, and if Congress does not pass a rescission bill within 45 days of continuous session, the administration has to release the funds.4Office of the Law Revision Counsel. 2 U.S. Code 683 – Rescission of Budget Authority Deferrals are allowed temporarily, but they cannot be used as a backdoor way to kill funded programs. The Government Accountability Office can sue the executive branch to force release of improperly withheld money.
The line runs the other direction too. The Antideficiency Act bars any federal officer or employee from making or authorizing expenditures that exceed available appropriations.5Office of the Law Revision Counsel. 31 USC 1341 – Limitations on Expending and Obligating Amounts Violators face administrative discipline up to removal, and anyone who knowingly and willfully overspends can be fined up to $5,000, imprisoned for up to two years, or both. Agency heads must report violations to both the President and Congress.
Confirming or Rejecting Presidential Appointments
The President nominates cabinet secretaries, ambassadors, federal judges, and other senior officials, but none of them can take office without the Senate. Article II, Section 2 requires the Senate’s “advice and consent” for these appointments.6Legal Information Institute. U.S. Constitution Annotated Article II Section 2 Clause II The Senate can reject a nominee outright or simply refuse to schedule a vote, leaving the seat open. Either result shapes who runs the executive branch and who sits on the federal bench.
The Constitution does give the President a workaround: temporary appointments while the Senate is in recess, with those commissions expiring at the end of the Senate’s next session.7Legal Information Institute (LII). Recess Appointments Power – Overview The Senate has learned to close that opening. In NLRB v. Noel Canning (2014), the Supreme Court held that a recess shorter than ten days is “presumptively too short” to trigger the recess appointment power, and that the Senate is in session whenever it says it is and retains the capacity to conduct business under its own rules.8Justia U.S. Supreme Court Center. NLRB v. Canning, 573 U.S. 513 (2014) Brief pro forma sessions every few days can effectively block recess appointments. Congress has also legislated that recess appointees filling vacancies that existed while the Senate was in session may receive no salary until they are confirmed.
Approving Treaties and Tracking Executive Agreements
Any treaty the President negotiates requires approval by a two-thirds vote of the senators present.9U.S. Senate. About Treaties – Historical Overview The bar is deliberately high so that binding international obligations rest on broad consensus.10Congress.gov. Article 2 Section 2 Clause 2 – Constitution Annotated
Presidents sometimes reach international deals through executive agreements, which do not require Senate ratification. Congress has responded. Under the Case Act, the executive branch must transmit the text of any international agreement that is not a formal treaty to Congress within 60 days of the agreement entering into force, with classified agreements going to the foreign affairs committees under a secrecy injunction. Congress can also terminate executive agreements by legislation, and the Supreme Court in Dames & Moore v. Regan tied the strength of a president’s executive agreement authority to whether Congress had authorized or acquiesced in the action.11Legal Information Institute (LII). Legal Effect of Executive Agreements
Limiting the Use of Military Force
The Constitution splits military authority. Congress has the power to declare war; the President is Commander in Chief.12Legal Information Institute (LII) / Cornell Law School. War Powers Presidents have deployed forces without formal declarations of war many times, and Congress answered with the War Powers Resolution of 1973. It imposes three concrete requirements:
- The President must report to Congress within 48 hours whenever U.S. armed forces are introduced into hostilities or into a foreign nation while equipped for combat.13Office of the Law Revision Counsel. 50 USC Ch. 33 – War Powers Resolution
- The President must withdraw forces within 60 calendar days unless Congress declares war, specifically authorizes the deployment, or is physically unable to meet due to an attack on the United States.14Office of the Law Revision Counsel. 50 U.S. Code 1544 – Congressional Action
- The President can extend that deadline by up to 30 additional days only by certifying in writing that military necessity requires more time to safely withdraw the forces.14Office of the Law Revision Counsel. 50 U.S. Code 1544 – Congressional Action
As long as troops remain deployed, the President must report to Congress on the status, scope, and duration of the operation at least every six months. Presidents of both parties have questioned whether the resolution is constitutional, and compliance has been uneven, but the statute gives Congress a formal framework for demanding accountability over military action.
Undoing Agency Rules Through the Congressional Review Act
Federal agencies issue thousands of rules each year, and because agencies sit inside the executive branch, those rules extend presidential policy. The Congressional Review Act gives Congress a fast-track path to strike them down. When an agency finalizes a major rule, it must submit a report to Congress, and Congress then has 60 legislative days to pass a joint resolution of disapproval.15Office of the Law Revision Counsel. 5 U.S. Code 802 – Congressional Disapproval Procedure If the resolution passes both chambers and is signed by the President (or survives a veto override), the rule is treated as though it never took effect, and the agency cannot reissue it in substantially the same form unless a later law authorizes it.16Office of the Law Revision Counsel. 5 U.S. Code 801 – Congressional Review
The tool is especially potent in the opening months of a new administration. Because the 60-day clock runs on legislative days, rules finalized late in one administration often remain open to review well into the next, letting a new Congress aligned with a new president reverse the previous administration’s regulatory record. Outside the CRA, Congress can also narrow the statutory authority it delegates to agencies, attach conditions to grants of power, and defund enforcement of policies it opposes.
Oversight, Subpoenas, and Contempt
Even outside formal legislation, Congress applies continuous pressure on the executive branch through oversight. Committees hold hearings, demand documents, and investigate agency conduct and senior officials. The Constitution does not spell this power out, but it has been recognized since the earliest days of the republic as essential to the legislative function, rooted in the Necessary and Proper Clause.17Constitution Annotated. Overview of Congress’s Investigation and Oversight Powers
When witnesses or agencies refuse to cooperate, Congress can issue subpoenas compelling testimony or the production of documents.17Constitution Annotated. Overview of Congress’s Investigation and Oversight Powers Subpoenas are backed by contempt authority: an inherent power to arrest and detain, a statutory criminal contempt process referred to the Department of Justice, and a Senate civil contempt statute allowing it to seek a court order compelling compliance. Each has practical limits, especially when the executive claims privilege, and enforcement fights can drag on for years. The tools still give congressional investigations real weight.
Impeachment and Removal
Impeachment is the most dramatic check Congress holds. The House has the sole power to impeach the President, formally charging misconduct. The Constitution limits impeachable offenses to treason, bribery, or other “high Crimes and Misdemeanors.”18Cornell Law Institute. The Power of Impeachment – Overview A simple majority in the House is enough to impeach.
The case then moves to the Senate for trial. When the defendant is the President, the Chief Justice of the United States presides in place of the Vice President and can make procedural and evidentiary rulings, though the Senate can override those rulings by majority vote. Conviction requires a two-thirds vote of the senators present.18Cornell Law Institute. The Power of Impeachment – Overview
Conviction removes the President from office. The Senate can then take an additional step: voting to permanently bar the convicted official from ever holding federal office again. That disqualification vote requires only a simple majority, not the two-thirds threshold needed for conviction.19Congress.gov. The Impeachment Process in the Senate Impeachment does not block separate criminal prosecution, and the presidential pardon power does not extend to cases of impeachment, so a president cannot pardon their way out of the process.18Cornell Law Institute. The Power of Impeachment – Overview
Deciding Presidential Disability Under the 25th Amendment
The 25th Amendment gives Congress a role in resolving disputes about whether a president is fit to serve. If the Vice President and a majority of the cabinet (or another body Congress designates) declare in writing that the President cannot perform the duties of office, the Vice President immediately becomes Acting President. The President can contest that by declaring in writing that no inability exists. If the Vice President and cabinet reassert the claim within four days, Congress must assemble within 48 hours and decide the issue within 21 days. Keeping the President sidelined requires a two-thirds vote of both chambers; otherwise the President resumes power.20National Constitution Center. 25th Amendment – Presidential Disability and Succession The provision has never been invoked against a president’s wishes, but it remains available if the presidency is genuinely incapacitated.