The President's Constitutional Power
The U.S. Constitution, in Article I, Section 7, gives the president the power to reject a bill passed by Congress. After both the House of Representatives and the Senate approve a piece of legislation, it goes to the president's desk. The president then has ten days (excluding Sundays) to act. If the president signs the bill, it becomes law. If they object, they can return it to the chamber where it originated with a message explaining their opposition—this is the 'regular' veto. This power serves as a critical check on the legislative branch, preventing bills the president deems unwise or unconstitutional from becoming law. It's not just a tool for blocking laws; the mere threat of a veto can force Congress to change a bill to make it more
acceptable to the White House.
The Magic Number: Two-Thirds
To overcome a president's objections, Congress needs to demonstrate overwhelming, bipartisan consensus. The Constitution requires a two-thirds vote in both the House and the Senate to override a presidential veto. This doesn't mean two-thirds of all elected members, but rather two-thirds of the members present and voting at the time, assuming a quorum (a majority of members) is present. If the House needs to override a veto, it takes the first vote. If it succeeds, the measure then goes to the Senate. If the first chamber fails to reach the two-thirds threshold, the process stops, and the president's veto is sustained. For example, if 435 members of the House and 100 senators are present and voting, an override would require 290 votes in the House and 67 in the Senate. The high bar ensures that only legislation with exceptionally broad support can become law without the president's approval.
Why the Bar Is So High
The framers of the Constitution designed the veto override to be difficult on purpose. It's a cornerstone of the system of checks and balances, intended to force negotiation between the legislative and executive branches. By requiring a supermajority, not a simple majority, the Constitution ensures that a narrow partisan majority in Congress cannot simply ignore the president's executive judgment. Overriding a veto is meant to be a rare event, reserved for moments when Congress believes the president has made a significant error or is acting against the overwhelming will of the public and their representatives. Historically, this has proven to be the case. Of the thousands of regular vetoes issued since 1789, only a small fraction—just over 7%—have ever been overridden by Congress.
A Look at the 'Pocket Veto'
There's another, more subtle type of veto that Congress cannot override: the 'pocket veto'. This happens when Congress passes a bill and then adjourns before the ten-day review period is over. If the president simply takes no action—neither signing nor vetoing the bill—it does not become law. This is called a pocket veto because the president effectively sticks the bill in a pocket and lets it expire. Since Congress is not in session, it cannot receive a veto message and therefore has no opportunity to vote to override it. The only recourse for Congress is to reintroduce the legislation in the next session and start the entire process over again.
Historic Veto Showdowns
Throughout American history, successful veto overrides have often marked moments of significant political conflict. The first successful override occurred in 1845 against President John Tyler. More recently, Congress overrode President Barack Obama's veto of the Justice Against Sponsors of Terrorism Act in 2016. President George W. Bush had four of his 12 vetoes overridden, including one concerning Medicare funding. On the other hand, some presidents with immense political capital or who faced a less confrontational Congress, like Lyndon B. Johnson, never had a veto overridden. These instances highlight just how much political muscle and cross-party agreement it takes to reach the supermajority needed to turn a rejected bill into the law of the land.
