---
title: "Override Of Veto | Constitutional Law I"
description: "Override of veto is Congress’s power to cancel a presidential veto with two-thirds votes in both chambers, showing checks and balances in action."
canonical: "https://fiveable.me/constitutional-law-i/key-terms/override-of-veto"
type: "key-term"
subject: "Constitutional Law I"
unit: "Unit 8"
---

# Override Of Veto | Constitutional Law I

## Definition

An override of veto is Congress’s power to pass a bill into law despite a presidential veto, but only with a two-thirds vote in both the House and Senate. In Constitutional Law I, it shows how checks and balances limit executive power.

## What It Is

An override of veto is the Constitution’s backup move when Congress wants a bill to become law even after the president rejects it. The president can veto legislation, but Congress can reverse that veto with a two-thirds vote in both the House and the Senate. If Congress misses that threshold, the bill dies and does not become law.

In Constitutional Law I, this power sits inside Article I’s lawmaking process. A bill does not just need to pass both chambers, it also has to survive the president’s signature or a veto override. That extra step shows that federal lawmaking is shared, not owned by one branch.

The two-thirds requirement is what makes the override hard. It is not enough for a simple majority to dislike the veto, because the Constitution demands broad agreement across each chamber. That usually means the bill has support well beyond party lines, or at least enough members of the president’s party are willing to break ranks.

This is why veto overrides are relatively rare. Presidents often use the veto as leverage, and Congress often cannot gather enough votes to defeat it. In practice, that means the veto is a strong executive tool, while the override is a weaker but still meaningful congressional check.

A quick way to picture it is this: Congress writes the bill, the president can block it, and Congress can only push back if it has enough votes to prove the opposition is unusually strong. The process is less about routine disagreement and more about situations where Congress is determined to stand behind a bill despite executive resistance.

The override also helps explain how separation of powers works in real life. The branches are not isolated, they push against each other through formal procedures. A veto override is one of the clearest examples of Congress asserting its legislative authority while still operating inside constitutional limits.

## Why It Matters

Override of veto matters because it shows that congressional power is real, but not unlimited. In Constitutional Law I, this term is a clean example of how the Constitution builds friction into government so that a bill needs support from multiple institutions before becoming law.

It also helps you read disputes about presidential and congressional power. If a court case, classroom hypothetical, or legislative scenario mentions a veto, you should immediately think about whether Congress has the numbers to override it. That changes the practical outcome, even if the lawmaking process starts the same way.

The concept also connects to political strategy. A president may veto a bill partly to signal opposition, bargain for changes, or force Congress to show whether it has enough unity to override. Congress, in turn, has to decide whether the policy is worth spending political capital on when the odds are low.

For doctrine, the override of veto is a simple but powerful way to see checks and balances in motion. It ties together bicameral passage, executive review, and the constitutional design that makes lawmaking difficult on purpose.

## Connections

### Veto

The veto is the president’s power to reject legislation after Congress passes it. An override only matters if a veto happens first, so the two terms are two sides of the same lawmaking checkpoint. In a case or scenario, the veto shows executive resistance, while the override shows Congress’s chance to push back.

### Checks and Balances

This is the bigger constitutional idea behind the override of veto. The president checks Congress by blocking a bill, and Congress checks the president by trying to reverse that block. If you are tracing separation of powers, the override is one of the clearest examples of the branches restraining each other through formal procedure.

### [Bicameralism](/constitutional-law-i/key-terms/bicameralism)

A veto override has to pass both the House and the Senate, so it depends on bicameralism. That means Congress is not acting as one body, and the same supermajority burden applies in each chamber. If one chamber has the votes and the other does not, the override fails even if support is strong in part of Congress.

### Legislation

Override of veto is one step in the larger process of making legislation into law. A bill can pass Congress and still fail if the president vetoes it and Congress cannot override. That makes the override a useful way to see that legislation is not finished when both chambers vote yes.

## On the AP Exam

A quiz question or short essay may give you a bill that passed Congress, a presidential veto, and a vote count, then ask whether the bill becomes law. Your job is to spot the two-thirds requirement in both chambers and explain the result, not just identify that a veto happened.

In a case analysis or class discussion, you might use the term to show how Congress can respond when the president objects to legislation. If the facts say the House reached two-thirds but the Senate did not, you should say the override fails. That kind of detail matters because one chamber falling short keeps the bill from becoming law.

When you are comparing powers of Congress and the president, this term helps you explain why the veto is strong but not final. It is a good term to use any time a prompt asks about checks and balances, the legislative process, or a conflict between branches.

## override of veto vs veto

A veto is the president’s power to reject a bill. An override of veto is Congress’s counterpower to cancel that rejection, but only with a two-thirds vote in both chambers. People mix them up because they happen in the same part of the lawmaking process, but one is executive resistance and the other is legislative pushback.

## Key Takeaways

- An override of veto is Congress’s power to turn a vetoed bill into law, but only with two-thirds support in both the House and Senate.
- This term is a direct example of checks and balances, because the executive branch can block a bill and Congress can still try to force it through.
- The supermajority requirement makes overrides rare, so a failed override usually means the president’s objection stands.
- A bill that is vetoed and not overridden does not become law, even if it already passed both chambers.
- In Constitutional Law I, the term is easiest to use when you are tracing the exact steps of the legislative process or comparing congressional power to presidential power.

## FAQs

### What is override of veto in Constitutional Law I?

It is Congress’s power to pass a bill into law after the president vetoes it, but only if both the House and Senate reach a two-thirds vote. In Constitutional Law I, it shows how the Constitution lets Congress challenge executive action. If Congress falls short in either chamber, the veto stands.

### How many votes are needed for a veto override?

Congress needs two-thirds of both chambers. That means a simple majority is not enough, and the requirement applies separately to the House and the Senate. If one chamber has the votes and the other does not, the override fails.

### What is the difference between a veto and an override of veto?

A veto is the president rejecting a bill. An override of veto is Congress trying to cancel that rejection and enact the bill anyway. The two terms are related, but they describe opposite moves in the lawmaking process.

### Why are veto overrides rare?

They are rare because two-thirds support in both chambers is a high bar. Congress often has enough members to pass a bill by ordinary majority, but not enough to overcome a presidential veto. That makes the veto a strong tool and the override a difficult constitutional check.

## Related Study Guides

- [8.1 Powers and Limitations of Congress](/constitutional-law-i/unit-8/powers-limitations-congress/study-guide/KUHtzjwJL33cnHAU)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
- [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`)
- [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)

## Structured Data

```json
{"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/constitutional-law-i/key-terms/override-of-veto#resource","name":"Override Of Veto | Constitutional Law I","url":"https://fiveable.me/constitutional-law-i/key-terms/override-of-veto","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/constitutional-law-i/key-terms/override-of-veto#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-07-03T02:21:05.646Z","isPartOf":{"@type":"Collection","name":"Constitutional Law I Key Terms","url":"https://fiveable.me/constitutional-law-i/key-terms"},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/constitutional-law-i/key-terms/override-of-veto#term","name":"override of veto","description":"An override of veto is Congress’s power to pass a bill into law despite a presidential veto, but only with a two-thirds vote in both the House and Senate. In Constitutional Law I, it shows how checks and balances limit executive power.","url":"https://fiveable.me/constitutional-law-i/key-terms/override-of-veto","inDefinedTermSet":{"@type":"DefinedTermSet","name":"Constitutional Law I Key Terms","url":"https://fiveable.me/constitutional-law-i/key-terms"}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is override of veto in Constitutional Law I?","acceptedAnswer":{"@type":"Answer","text":"It is Congress’s power to pass a bill into law after the president vetoes it, but only if both the House and Senate reach a two-thirds vote. In Constitutional Law I, it shows how the Constitution lets Congress challenge executive action. If Congress falls short in either chamber, the veto stands."}},{"@type":"Question","name":"How many votes are needed for a veto override?","acceptedAnswer":{"@type":"Answer","text":"Congress needs two-thirds of both chambers. That means a simple majority is not enough, and the requirement applies separately to the House and the Senate. If one chamber has the votes and the other does not, the override fails."}},{"@type":"Question","name":"What is the difference between a veto and an override of veto?","acceptedAnswer":{"@type":"Answer","text":"A veto is the president rejecting a bill. An override of veto is Congress trying to cancel that rejection and enact the bill anyway. The two terms are related, but they describe opposite moves in the lawmaking process."}},{"@type":"Question","name":"Why are veto overrides rare?","acceptedAnswer":{"@type":"Answer","text":"They are rare because two-thirds support in both chambers is a high bar. Congress often has enough members to pass a bill by ordinary majority, but not enough to overcome a presidential veto. That makes the veto a strong tool and the override a difficult constitutional check."}}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Constitutional Law I","item":"https://fiveable.me/constitutional-law-i"},{"@type":"ListItem","position":2,"name":"Key Terms","item":"https://fiveable.me/constitutional-law-i/key-terms"},{"@type":"ListItem","position":3,"name":"Unit 8","item":"https://fiveable.me/constitutional-law-i/unit-8"},{"@type":"ListItem","position":4,"name":"override of veto"}]}]}
```