
The topic of oaths and whether they are necessary in a free country has been a subject of debate for centuries. In the United States, officials swore allegiance to the king when the country was a colony of Great Britain. Today, members of the House take an oath to uphold the Constitution, and senators also sign an oath of office to support and defend the Constitution of the United States.
| Characteristics | Values |
|---|---|
| Is an oath of allegiance required to be signed by senators? | Yes |
| When did this practice start? | 1789 |
| Is there a religious text senators swear on? | No, but most use a Bible |
| What is the oath? | "I 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." |
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What You'll Learn

The US Constitution and the oath of office
The US Constitution requires senators, representatives, state legislators, and all executive and judicial officers to take an oath or affirmation to support the Constitution. This is known as the oath of office or swearing-in ceremony, and it is a long-standing tradition in government.
The text of the oath, as outlined in Article VI, Clause 3 of the US Constitution, is:
> "The Senators and Representatives before mentioned, and the Members of the several State Legislatures, and all executive and judicial Officers, both of the United States and of the several States, shall be bound by Oath or Affirmation, to support this Constitution; but no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States."
The specific practice of senators signing individual pages in an oath book dates back to the Civil War. At the time, Congress allowed some former Confederates to take only a specific section of the oath, which caused controversy and led to changes in the oath's structure over time.
The current oath of office for senators is:
> "I 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."
This oath is taken at the start of each new Congress, in January of every odd-numbered year, when one-third of senators take the oath to begin their new terms. The oath-taking practice dates back to the First Congress in 1789, but the current version was drafted during the Civil War.
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The history of the oath
Oaths of office and allegiance have been a feature of government for centuries. When the United States were colonies of Great Britain, officials swore allegiance to the king. Colonial and state legislatures also created oaths that required members to swear allegiance to the state and often profess a belief in God as well.
In 1789, the First Congress adopted a simple oath: "I do solemnly swear (or affirm) that I will support the Constitution of the United States." The oath-taking practice dates back to this First Congress, but the current oath is a product of the 1860s, drafted during the Civil War.
At the outbreak of the Civil War in April 1861, a time of uncertain and shifting loyalties, President Abraham Lincoln ordered all federal civilian employees within the executive branch to take an expanded oath. At the conclusion of its emergency session that summer, Congress adopted legislation requiring executive branch employees to take the expanded oath in support of the Union.
In July 1862, Congress added a new section to the oath, which became known as the "Ironclad Test Oath." The Test Oath required civilian and military officials to swear or affirm that they had never aided or encouraged “persons engaged in armed hostility” against the United States. Government employees who swore falsely would be prosecuted for perjury and forever denied federal employment.
Following the Civil War, Congress permitted some former Confederates to take only the second section of the 1862 oath, and an 1868 statute prescribed this alternative oath for "any person who has participated in the late rebellion, and from whom all legal disabilities arising therefrom have been removed by act of Congress." Northerners complained of the law's unfair double standard, which required loyal Unionists to take the Test Oath's harsh first section while permitting ex-Confederates to ignore it. In 1884, after more than a decade of such complaints, a new generation of lawmakers repealed the first section of the Test Oath, leaving intact today's affirmation of constitutional allegiance.
The current practice of newly sworn senators signing individual pages in an elegantly bound oath book dates from this period.
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The current oath
> I 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.
The practice of newly sworn senators signing individual pages in an elegantly bound oath book also dates from this period.
The Constitution does not specify what the swearing-in ceremony must include, and there is no religious test required as a qualification for office. For example, while most Presidents-elect chose a Bible for their swearing-in, John Quincy Adams used a book of law, and Teddy Roosevelt did not use any book.
The oath of office is taken at the start of each new Congress, in January of every odd-numbered year, when one-third of senators take the oath to begin their new terms.
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The swearing-in ceremony
The Constitution does not outline a specific format for the swearing-in ceremony, but traditionally, the President-elect takes their oath on a Bible. However, this is not always the case, as John Quincy Adams used a book of law, and Teddy Roosevelt did not use any book. The Vice President's oath is administered immediately before that of the President, and they are inaugurated in the same ceremony.
The current practice of newly sworn senators signing individual pages in an elegantly bound oath book dates back to the Civil War. The oath taken by senators today is a product of that time, drafted to address uncertain and shifting loyalties. The current oath is as follows:
> I 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.
The oath is taken in January of every odd-numbered year when one-third of senators take the oath of office to begin their new terms. This practice dates back to the First Congress in 1789.
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The role of religion in the oath
Historically, when the United States were colonies of Great Britain, officials swore allegiance to the king and often included a profession of belief in God. This tradition continued with colonial and state legislatures creating oaths that required members to swear allegiance to the state and profess a belief in God.
However, with the establishment of the United States as a nation, the role of religion in the oath evolved. The First Congress in 1789 adopted a simple oath: "I do solemnly swear (or affirm) that I will support the Constitution of the United States." This oath provided an option for individuals to choose between swearing or affirming, accommodating a range of religious and non-religious beliefs.
During the Civil War, the oath was revised to address concerns about traitors, resulting in the addition of the "Ironclad Test Oath." This new section required civilian and military officials to declare that they had never aided or encouraged "persons engaged in armed hostility" against the United States. Despite these changes, the core principle of excluding religious tests as a qualification for office remained intact.
In modern times, the oath of office for senators and other officials continues to uphold the separation of church and state. While some individuals may choose to include religious phrases or use a religious text during their swearing-in ceremony, it is not a mandatory requirement. The focus of the oath remains on the commitment to uphold the Constitution, rather than any religious affiliation or belief.
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Frequently asked questions
Yes, senators do sign an oath to the US Constitution. The current practice of newly sworn senators signing individual pages in an elegantly bound oath book dates back to the Civil War.
The oath taken by senators is: "I 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."
At the start of each new Congress, in January of every odd-numbered year, one-third of senators take the oath of office to begin their new terms.
The US Constitution states that senators and other officials "shall be bound by Oath or Affirmation, to support this Constitution; but no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States."
























