Before a new senator or representative can cast a vote, introduce a bill, or draw a federal paycheck, they must take the Congress oath of office on the floor of their chamber. The words are set by federal statute and are identical for both houses: “I, [name], do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter. So help me God.”1Office of the Law Revision Counsel. 5 USC 3331 – Oath of Office
Until a member-elect finishes this process, they have no legislative power and are not entitled to a seated member’s privileges.2U.S. Government Publishing Office. House Practice – Chapter 33 – Oaths
Where the Requirement Comes From
Article VI, Clause 3 of the Constitution requires that all senators and representatives “be bound by Oath or Affirmation, to support this Constitution.”3Congress.gov. Constitution Annotated – Article VI Clause 3 Oaths of Office The Constitution demands the oath but leaves the exact words to Congress. Today those words come from 5 U.S.C. § 3331, which applies to every federal officer and employee except the President, who has a separate oath in the Constitution itself.1Office of the Law Revision Counsel. 5 USC 3331 – Oath of Office A second statute, 2 U.S.C. § 25, sets the mechanics for the House chamber: who administers the oath, what paperwork follows, and how it enters the record.4Office of the Law Revision Counsel. 2 USC 25 – Oath of Speaker, Members, and Delegates
The current wording dates to 1884. A longer Civil War-era version, the Ironclad Test Oath of 1862, had required officials to swear they had never aided the Confederacy. As former Confederate states rejoined the Union, that backward-looking language became unworkable, and Congress repealed it, leaving the forward-looking pledge members still recite.5U.S. Senate. Oath of Office
Swear or Affirm, and the Question of a Bible
The statute offers a choice between “swear” and “affirm,” and federal regulations treat an affirmation as carrying the same legal weight as an oath.6eCFR. 22 CFR 92.18 – Oaths and Affirmations Defined A member with religious or conscientious objections to swearing can affirm instead. Article VI also explicitly prohibits religious tests for federal office.3Congress.gov. Constitution Annotated – Article VI Clause 3 Oaths of Office
No federal rule requires a hand on a Bible or any other book. The House’s official mass swearing-in on the floor does not involve a Bible at all. Members who want to use a religious text, a copy of the Constitution, or a family heirloom typically do so afterward at a separate ceremonial photo, not during the legally binding oath.
How the House Does It
Under the 20th Amendment, a new Congress begins at noon on January 3 of each odd-numbered year.7Congress.gov. U.S. Constitution – Twentieth Amendment The House chamber fills with all 435 members-elect, and no legislative business can happen until the House elects a Speaker and every member takes the oath.
The order is fixed. The longest-serving member, known as the Dean of the House, administers the oath to the newly elected Speaker. The Speaker then turns around and administers the oath to every other member-elect and delegate at once, in a single mass ceremony on the House floor.4Office of the Law Revision Counsel. 2 USC 25 – Oath of Speaker, Members, and Delegates
How the Senate Does It
The Senate’s process is one member at a time. Because only about a third of the 100 seats turn over in any cycle, fewer senators need to be sworn in on opening day. Each senator-elect is individually escorted to the presiding officer’s desk by another senator, customarily the other senator from their home state, though any senator can serve as escort.8U.S. Senate. About Traditions and Symbols – Taking the Oath
The Vice President, acting as President of the Senate, typically administers the oath. When the Vice President is unavailable, the President pro tempore steps in with the same authority.9U.S. Senate. About the President Pro Tempore The ceremony takes place in open session.
Signing the Record
Speaking the oath is only half the job. Both chambers require signed documentation, and those signed records carry legal weight.
In the House, each member signs two printed copies of the oath. One goes into the permanent records of the House, and the other is entered in both the Congressional Record and the Journal of the House. Federal law treats these signed copies as conclusive proof in any U.S. court that the member lawfully took the oath.4Office of the Law Revision Counsel. 2 USC 25 – Oath of Speaker, Members, and Delegates
In the Senate, newly sworn senators sign individual pages in what the Senate calls an “elegantly bound oath book,” a practice that traces to the Civil War, when officials had to sign copies of the Test Oath to do business with the federal government.5U.S. Senate. Oath of Office The Secretary of the Senate keeps the record.
Mid-Term Vacancies and Special Elections
Not every member takes the oath on January 3. When a seat opens mid-term through death, resignation, or expulsion, the replacement follows a different path in each chamber.
In the House, the winner of a special election must present a valid certificate of election before the Speaker can administer the oath. When there is no controversy, the House typically grants unanimous consent to swear in the new member immediately, and a quorum does not need to be present.10Govinfo. Precedents of the House
In the Senate, the 17th Amendment allows state governors, when authorized by their state legislature, to appoint a replacement to fill a vacant seat. The appointee takes the oath on the Senate floor, sometimes on the same day as the appointment and sometimes more than two weeks later.11U.S. Senate. Appointed Senators
When Someone Challenges a Member-Elect’s Right to Be Sworn
Any member can challenge another member-elect’s right to take the oath. Challenges typically involve disputed election results or questions about the constitutional qualifications for office: age, citizenship, and residency.
In the House, the Speaker asks the challenged member-elect to remain seated while everyone else stands and takes the oath.2U.S. Government Publishing Office. House Practice – Chapter 33 – Oaths The House itself, not the Speaker, then decides what happens. Three outcomes are possible:
- The House passes a resolution authorizing the Speaker to administer the oath, effectively dismissing the challenge.
- The House authorizes the oath based on the member-elect’s initial right to the seat but refers the final determination to the Committee on House Administration.
- The House refers both the initial and final right to committee without authorizing the oath, leaving the member-elect unable to participate until the matter is resolved.
If a member-elect simply never appears to take the oath, the House can pass a resolution declaring the seat vacant after a specified deadline. The rest of the House’s organizational business can proceed while the dispute is pending.