who administer the oath of office to the president
Oath of office of the President of the United States While the Constitution does not mandate that anyone in particular should administer the presidential oath of office, it is typically administered by the Chief Justice. There have been several exceptions, however. George Washington was sworn into office during his first inauguration, on April 30, 1789, by Chancellor of New York Robert Livingston.[3][4] William Cranch, chief judge of the U.S. Circuit Court, administered the oath to Millard Fillmore on July 10, 1850, when he became president after the death of Zachary Taylor.[5] Upon being informed of Warren Harding's death, while visiting his family home in Plymouth Notch, Vermont, Calvin Coolidge was sworn in as president by his father, John Calvin Coolidge Sr., a notary public.[6][7] Federal Judge Sarah T. Hughes administered the oath of office to Lyndon B. Johnson aboard Air Force One after John F. Kennedy's assassination on November 22, 1963. This was the first (and to date only) time a woman administered the oath of office. Overall, the presidential oath has been administered by 15 Chief Justices (one of whom—William Howard Taft—was also a former president), one Associate Justice, four federal judges, two New York state judges, and one notary public.
Oath of office When Congress returned for its regular session in December 1861, members who believed that the Union had as much to fear from northern traitors as southern soldiers again revised the oath, adding a new first section known as the "Ironclad Test Oath." The war-inspired Test Oath, signed into law on July 2, 1862, required "every person elected or appointed to any office ... under the Government of the United States ... excepting the President of the United States" to swear or affirm that they had never previously engaged in criminal or disloyal conduct.[69] Those government employees who failed to take the 1862 Test Oath would not receive a salary; those who swore falsely would be prosecuted for perjury and forever denied federal employment.