Senate Rule 22 is the Senate’s cloture rule, the only mechanism in the chamber’s standing rules for ending debate and forcing a final vote. It sets a 60-vote threshold to cut off discussion on most legislation, which is what gives the filibuster its power: 41 senators who refuse to let debate end can block a bill outright. A higher bar, two-thirds of senators present and voting, applies when the Senate considers changes to its own standing rules.1U.S. Senate. Rules of the Senate
What Rule 22 Does
Senate rules place no general time limit on how long a senator can speak. Unlike the House, the majority cannot simply call the question and move to a vote. Rule 22, adopted in 1917, created the only exception: a formal procedure called cloture that lets a supermajority shut off debate and bring a measure to a decision.
Cloture is not the same as passing a bill. It is a procedural vote on whether to end debate. Once debate ends, the underlying measure still needs a final vote, and at that point a simple majority is enough. The 60-vote requirement is the hurdle, not the finish line.
The Cloture Process Step by Step
The process begins with a written motion signed by at least 16 senators to close debate on a pending measure. The motion is presented to the presiding officer, who reads it to the full Senate immediately.1U.S. Senate. Rules of the Senate
The Senate does not vote on the motion right away. It has to ripen. The vote takes place one hour after the Senate convenes on the second calendar day of session following the day the motion was filed. Days when the Senate is not in session do not count, and Sundays are generally excluded unless the Senate meets to conduct legislative business.1U.S. Senate. Rules of the Senate A cloture motion filed on Monday would ripen for a vote one hour after the Senate convenes on Wednesday.
The waiting period gives senators time to negotiate and decide whether to end debate. In practice, the majority leader often files cloture preemptively on measures expected to face opposition, before any filibuster formally begins.
How Many Votes Cloture Requires
The threshold depends on what the Senate is debating. For most legislation, nominations (as modified by precedent), and other business, cloture requires three-fifths of the senators “duly chosen and sworn.” With all 100 seats filled, that means 60 affirmative votes.1U.S. Senate. Rules of the Senate
A higher threshold applies to any measure that would change the Senate’s own standing rules. There, cloture requires two-thirds of the senators present and voting.1U.S. Senate. Rules of the Senate
The difference between the two formulas matters. “Duly chosen and sworn” is a fixed number based on total Senate membership; if two seats are vacant, 60 votes are still needed out of the 98 seated senators. “Present and voting” is calculated only from those in the chamber for the roll call, so the exact number fluctuates with attendance. That two-thirds standard is what makes Rule 22 so difficult to amend directly: any attempt to change it can itself be filibustered, and overcoming that filibuster takes 67 votes if all senators are present.
What Happens After Cloture Is Invoked
A successful cloture vote does not end debate on the spot. It starts a clock. The Senate enters a post-cloture period with a hard cap of 30 additional hours of consideration, and everything counts against that total: speeches, roll call votes, quorum calls, and procedural motions. Each individual senator gets no more than one hour of debate time within the window.1U.S. Senate. Rules of the Senate
Cloture also locks down amendments. Any amendment offered after cloture must be germane to the pending measure, and dilatory motions or non-germane amendments are ruled out of order. Filing deadlines effectively require advance planning. A first-degree amendment must have been submitted in writing to the Journal Clerk by 1:00 p.m. on the day after the cloture motion was filed, and a second-degree amendment must have been filed at least one hour before the cloture vote itself.1U.S. Senate. Rules of the Senate Senators who miss those deadlines cannot offer new amendments unless the full Senate agrees by unanimous consent.
Once the 30 hours expire, the Senate proceeds directly to a final vote on the measure with no further debate. At that point, a simple majority passes the bill or confirms the nominee.
Where the 60-Vote Threshold Does Not Apply
Rule 22 governs most legislation, but Congress has carved out categories of business that cannot be filibustered.
Budget Reconciliation
The largest exception is budget reconciliation, which lets Congress pass certain tax and spending measures with 51 votes. Reconciliation bills are limited to 20 hours of debate and cannot be filibustered. Congress can use reconciliation for three subjects each fiscal year: spending, revenues, and the federal debt limit.
The tradeoff is the Byrd Rule, which bars provisions that are “extraneous” to the budget. A provision fails the Byrd Rule if it has no budgetary effect, if its budgetary impact is merely incidental to a policy change, or if it increases deficits beyond the reconciliation window. The Byrd Rule also bars changes to Social Security. Any senator can raise a point of order against a violating provision, and overriding that objection takes 60 votes. Major reconciliation bills often have provisions stripped out at the last minute for this reason.
Congressional Review Act
Under the Congressional Review Act, Congress can overturn a federal agency’s final rule by passing a joint resolution of disapproval. These resolutions have fast-track protection in the Senate, cannot be filibustered if they meet certain procedural criteria, and require only a simple majority. Congress has 60 days of continuous session to act after a rule is submitted for review. If the review period is cut short by adjournment, it restarts in the next session of Congress.
Presidential Nominations
Since 2013, presidential nominations have been progressively removed from the 60-vote requirement through changes in Senate precedent rather than through the text of Rule 22. Executive branch nominees and most judicial nominees can now be confirmed with a simple majority. Supreme Court nominees have been subject to the same simple-majority threshold since 2017. In 2019, the Senate further reduced post-cloture debate time for district court judges and sub-cabinet executive nominees from 30 hours to 2 hours, though circuit court judges and Supreme Court justices still get the full 30 hours.
How Rule 22 Has Changed
Before 1917, the Senate had no way to end debate at all. A filibuster could run indefinitely. That changed after a group of senators filibustered a bill to arm American merchant ships during World War I, prompting President Woodrow Wilson to condemn what he called “a little group of willful men” who had “rendered the great Government of the United States helpless and contemptible.”2U.S. Senate. Idea of the Senate – The Senate as Protector of Minority Rights Four days later the Senate adopted Rule 22, allowing two-thirds of senators present and voting to invoke cloture.
In 1975, the Senate lowered the threshold for legislation to three-fifths of all senators duly chosen and sworn, producing the 60-vote standard used today.3U.S. Senate. About Filibusters and Cloture – Historical Overview The two-thirds requirement was kept only for motions to change the Senate’s own rules.
The Nuclear Option
The most significant recent changes have come not through formal amendments to Rule 22 but through a procedural workaround called the nuclear option. The Senate governs itself through three mechanisms: its standing rules, standing orders such as unanimous consent agreements, and precedents that determine how the rules are interpreted. Changing the written text requires the near-impossible 67-vote cloture threshold. Changing a precedent requires only a simple majority.
The nuclear option exploits that gap. The presiding officer makes a ruling that interprets an existing rule in a new way. The minority appeals. The majority moves to table the appeal, a non-debatable motion that needs only a simple majority. If tabling succeeds, the new ruling stands as precedent, effectively changing how the rule operates without touching its text.
Senate Democrats first used the maneuver in November 2013 to eliminate the 60-vote cloture requirement for executive branch nominees and most judicial nominees below the Supreme Court. Senate Republicans extended the precedent to Supreme Court nominations in April 2017. The written text of Rule 22 still reads “three-fifths of the Senators duly chosen and sworn,” but for nominations that language is now interpreted to mean a simple majority. In January 2022, an effort to change Senate rules to create a filibuster exception for voting rights legislation failed when it could not secure even a simple majority, with two members of the majority party joining the opposition. The legislative filibuster remains intact, but nothing in the Senate’s structure permanently prevents a future majority from using the nuclear option to change that.