Article II, Section 1, Clause 8:
Before he enter on the Execution of his Office, he shall take the following Oath or Affirmation:–I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States.
The Oath Act of June 1, 1789, was the first legislation passed by the Senate and the first law signed by President George Washington. It prescribed the following oath: “I __ do solemnly swear (or affirm) that I will support the Constitution of the United States.”
On this date, the Oath of Office bill, the first legislative act of Congress, was signed by the Speaker of the House of Representatives. President George Washington signed the bill into law on June 1, 1789. The simple text read, “I, A.B., do solemnly swear or affirm (as the case may be) that I will support the Constitution of the United States.”
In December 1990, the Judicial Improvements Act of 1990 replaced the phrase “according to the best of my abilities and understanding, agreeably to the Constitution" with "under the Constitution.” The revised Judicial Oath, found at 28 U. S. C. § 453, reads:
“I, _________, do solemnly swear (or affirm) that I will administer justice without respect to persons, and do equal right to the poor and to the rich, and that I will faithfully and impartially discharge and perform all the duties incumbent upon me as _________ under the Constitution and laws of the United States. So help me God.”
Illinois elected officials: SECTION 3. OATH OR AFFIRMATION OF OFFICE
Each prospective holder of a State office or other State position created by this Constitution, before taking office, shall take and subscribe to the following oath or affirmation: "I do solemnly swear (affirm) that I will support the Constitution of the United States, and the Constitution of the State of Illinois, and that I will faithfully discharge the duties of the office of .... to the best of my ability." (Source: Illinois Constitution.)
From the State of Iowa Constitution: Oath of office. Section 5. Every person elected or appointed to any office, shall, before entering upon the duties thereof, take an oath or affirmation to support the Constitution of the United States, and of this State, and also an oath of office.
To become a naturalized citizen of the United states: "I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty, of whom or which I have heretofore been a subject or citizen; that I will support and defend the Constitution and laws of the United States of America against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I will bear arms on behalf of the United States when required by the law; that I will perform noncombatant service in the Armed Forces of the United States when required by the law; that I will perform work of national importance under civilian direction when required by the law; and that I take this obligation freely, without any mental reservation or purpose of evasion; so help me God."
It is time that all of us who were born in the great republic to renew our oath to support the Constitution of the United States, to uphold the Constitution of the United States!