President-elect of the United States in the context of "President's Daily Brief"

In the United States, a presidential transition is the process during which the president-elect of the United States prepares to take over the administration of the federal government of the United States from the incumbent president. Though planning for transition by a non-incumbent candidate can start at any time before a presidential election and in the days following, the transition formally starts when the General Services Administration (GSA) declares an “apparent winner” of the election, thereby releasing the funds appropriated by Congress for the transition, and continues until inauguration day, when the president-elect takes the oath of office, at which point the powers, immunities, and responsibilities of the presidency are legally transferred to the new president.

The 20th Amendment to the Constitution, adopted in 1933, moved the beginning and ending of the terms of the president and vice president from March 4 to January 20, thereby also shortening the transition period. After the election, an outgoing president is commonly referred to as a lame-duck president. A transition can also arise intra-term if a president dies, resigns or is removed from office, though the period may be very short.

James Abram Garfield (November 19, 1831 – September 19, 1881) was the 20th president of the United States, serving from March 1881 until his death in September that year after being shot in July. A preacher, lawyer, and Civil War general, Garfield served nine terms in the United States House of Representatives and is the only sitting member of the House to be elected president. Before running for the presidency, he had been elected to the U.S. Senate by the Ohio General Assembly—a position he declined when he became president-elect.

Garfield was born into poverty in a log cabin and grew up in northeast Ohio. After graduating from Williams College in 1856, he studied law and became an attorney. He was a preacher in the Restoration Movement and president of the Western Reserve Eclectic Institute, affiliated with the Disciples. Garfield was elected as a Republican member of the Ohio State Senate in 1859, serving until 1861. He opposed Confederate secession, was a major general in the Union Army during the American Civil War, and fought in the battles of Middle Creek, Shiloh, and Chickamauga. He was elected to Congress in 1862 to represent Ohio's 19th district. Throughout his congressional service, he firmly supported the gold standard and gained a reputation as a skilled orator. He initially agreed with Radical Republican views on Reconstruction but later favored a Moderate Republican–aligned approach to civil rights enforcement for freedmen. Garfield's aptitude for mathematics extended to his own proof of the Pythagorean theorem, published in 1876, and his advocacy of using statistics to inform government policy.

Between seventy-three and seventy-nine days after the presidential election, the president-elect of the United States is inaugurated as president by taking the presidential oath of office. The inauguration takes place for each new presidential term, even if the president is continuing in office for another term.

The first inauguration of George Washington took place on April 30, 1789. Subsequent public inaugurations from 1793 until 1933 were held on March 4, with the exceptions of those in 1821, 1849, 1877, and 1917, when March 4 fell on a Sunday, thus the public inauguration ceremony took place on Monday, March 5. Since 1937, it has taken place at noon Eastern time on January 20, the first day of the new term, except in 1957, 1985, and 2013, when January 20 fell on a Sunday. In those years, the presidential oath of office was administered on that day privately and then again in a public ceremony the next day, on Monday, January 21. The most recent presidential inauguration was held on January 20, 2025, when Donald Trump reassumed office.

The Twentieth Amendment (Amendment XX) to the United States Constitution moved the beginning and ending of the terms of the president and vice president from March 4 to January 20, and of members of Congress from March 4 to January 3. It also has provisions that determine what is to be done when there is no president-elect. The Twentieth Amendment was adopted on January 23, 1933.

The amendment reduced the presidential transition and the "lame duck" period, by which members of Congress and the president serve the remainder of their terms after an election. The amendment established congressional terms to begin before presidential terms and that the incoming Congress, rather than the outgoing one, would hold a contingent election if the Electoral College deadlocked regarding either the presidential or vice presidential elections.

An acting president of the United States is a person who lawfully exercises the powers and duties of the president of the United States despite not holding the office in their own right. There is an established presidential line of succession in which officials of the United States federal government may be called upon to be acting president if the incumbent president becomes incapacitated, dies, resigns, or is removed from office (by impeachment by the House of Representatives and subsequent conviction by the Senate) during their four-year term of office; or if a president-elect has not been chosen before Inauguration Day or has failed to qualify by that date.

Presidential succession is referred to multiple times in the U.S. Constitution: Article II, Section 1, Clause 6, the Twentieth Amendment, and the Twenty-fifth Amendment. The vice president is the only officeholder explicitly named in the Constitution as a presidential successor. The Article II succession clause authorizes Congress to designate which federal officeholders would accede to the presidency if the vice president were unable to do so, a situation which has never occurred. The current Presidential Succession Act was adopted in 1947 and last revised in 2006. The order of succession is as follows: the vice president, the speaker of the House of Representatives, the president pro tempore of the Senate, and then the eligible heads of the federal executive departments who form the president's Cabinet in the order of creation of the department, beginning with the secretary of state.

The oath of office of the vice president of the United States is the oath or affirmation that the vice president of the United States takes upon assuming the vice-presidency but before beginning the execution of the office. It is the same oath that members of the United States Congress and members of the president's cabinet take upon entering office.

Before the president-elect takes the oath of office on Inauguration Day, the vice president-elect takes their oath of office. Although the United States Constitution—Article II, Section One, Clause 8—specifically sets forth the oath required by incoming presidents, it does not do so for incoming vice presidents. Instead, Article VI, Clause 3 provides that "all ... Officers ... of the United States ... shall be bound by Oath or Affirmation, to support this Constitution". Pursuant to Article VI, the 1st United States Congress passed the Oath Administration Act (that remains in effect) which provides that "...the said oath or affirmation ... [required by the sixth article of the Constitution of the United States] … shall be administered to [the President of the Senate]". Since 1937, Inauguration Day has been January 20 (was March 4 previously), a change brought about by the 20th amendment to the Constitution, which had been ratified four years earlier. The vice president's swearing-in ceremony also moved that year, from the Senate chamber inside the Capitol, to the presidential inaugural platform outside the building.

The presidential transition of George W. Bush took place following the 2000 United States presidential election. It started after Bush was declared the victor of the election on December 12, 2000, when the Bush v. Gore decision by the Supreme Court halted the election recount in Florida, making Bush the victor in that state. The decision delivered him the state's 25 electoral votes, thus giving him a total of 271 electoral votes. This was one more vote than the 270 needed to win the presidency outright, making him president-elect.

Due to the recount effort and litigation between Bush and his presidential opponent Al Gore leaving the outcome of the election unclear until December 12, 2000, Bush's official transition was abbreviated, at just 39 days. The transition was chaired by vice president-elect Dick Cheney.