Along with their general responsibilities as a member of the Supreme Court, the chief justice has several unique duties to fulfill.
Impeachment trials Article I, Section 3 of the U.S. Constitution stipulates that the chief justice shall
preside over the Senate trial of an
impeached president of the United States. Three chief justices have presided over presidential
impeachment trials: Salmon P. Chase (
1868 trial of Andrew Johnson), William Rehnquist (
1999 trial of Bill Clinton), and John Roberts (
2020 trial of Donald Trump; Roberts declined to preside over Trump's
second trial in 2021, which took place after the end of Trump's presidency. Senate
president pro-tempore Patrick Leahy presided). All three presidents were acquitted in the Senate. Although the Constitution is silent on the matter, the chief justice would, under Senate rules adopted in 1999 before the Clinton trial, preside over the trial of an impeached vice president. This rule was established to preclude the possibility of a vice president presiding over their own trial.
Seniority Many of the court's
procedures and inner workings are governed by the rules of protocol based on the
seniority of the justices. The chief justice always ranks first in the
order of precedence—regardless of the length of the officeholder's service (even if shorter than that of one or more associate justices). This elevated status has enabled successive chief justices to define and refine both the court's culture and its judicial priorities. The chief justice sets the agenda for the weekly meetings where the justices review the petitions for
certiorari, to decide whether to hear or deny each case. The Supreme Court agrees to hear less than one percent of the cases petitioned to it. While associate justices may append items to the weekly agenda, in practice this initial agenda-setting power of the chief justice has significant influence over the direction of the court. Nonetheless, a chief justice's influence may be limited by circumstances and the associate justices' understanding of
legal principles; it is definitely limited by the fact that they have only a single vote of nine on the decision whether to grant or deny certiorari. Despite the chief justice's elevated stature, their vote carries the same legal weight as the vote of each associate justice. Additionally, they have no legal authority to overrule the verdicts or interpretations of the other eight judges or tamper with them. Early in his tenure, Chief Justice John Marshall insisted upon holdings which the justices could unanimously back as a means to establish and build the court's national prestige. In doing so, Marshall would often write the opinions himself and actively discouraged dissenting opinions. Associate Justice
William Johnson eventually persuaded Marshall and the rest of the court to adopt its present practice: one justice writes an opinion for the majority, and the rest are free to write their own separate opinions or not, whether concurring or dissenting. The chief justice's formal prerogative—when in the majority—to assign which justice will write the court's opinion is perhaps their most influential power, •
Robert Livingston, as chancellor of the state of New York (the state's highest ranking judicial office), administered the oath of office to
George Washington at his first inauguration; there was no chief justice of the United States, nor any other federal judge before their appointments by President Washington in the months following his inauguration. •
William Cushing, an associate justice of the Supreme Court, administered Washington's second oath of office in 1793. •
John Calvin Coolidge Sr.,
Calvin Coolidge's father, a notary public, administered the oath to his son after the death of Warren Harding. This, however, was contested upon Coolidge's return to Washington, and his oath was re-administered by Judge
Adolph A. Hoehling, Jr. of the
United States District Court for the District of Columbia. •
John Tyler and
Millard Fillmore were both sworn in on the death of their predecessors by Chief Judge
William Cranch of the Circuit Court of the District of Columbia. •
Chester A. Arthur and
Theodore Roosevelt's initial oaths reflected the unexpected nature of their taking office. • On November 22, 1963, after the
assassination of President
John F. Kennedy, Judge
Sarah T. Hughes, a federal district court judge of the
United States District Court for the Northern District of Texas, administered the oath to
Lyndon B. Johnson aboard
Air Force One.
Other duties Since the tenure of
William Howard Taft, the office of chief justice has moved beyond just
first among equals. The chief justice also: • Serves as the head of the federal judiciary. • Serves as the head of the
Judicial Conference of the United States, the chief administrative body of the United States federal courts. The Judicial Conference is empowered by the
Rules Enabling Act to propose rules, which are then promulgated by the Supreme Court (subject to disapproval by Congress under the
Congressional Review Act), to ensure the smooth operation of the federal courts. Major portions of the
Federal Rules of Civil Procedure and
Federal Rules of Evidence have been adopted by most state legislatures and are considered canonical by American
law schools. • Appoints sitting federal judges to the membership of the
United States Foreign Intelligence Surveillance Court, a "secret court" which oversees requests for surveillance warrants by federal police agencies (primarily the
FBI) against suspected foreign
intelligence agents inside the United States (
see ), and also adopts security measures for maintaining records of section 702 proceedings (
see ). • Appoints sitting federal judges to the membership of the
United States Alien Terrorist Removal Court, a special court constituted to determine whether aliens should be deported from the United States on the grounds that they are terrorists. • Appoints the members of the
Judicial Panel on Multidistrict Litigation, a special tribunal of seven sitting federal judges responsible for selecting the venue for coordinated pretrial proceedings in situations where multiple related federal actions have been filed in different judicial districts. • Serves as an
ex officio member of the Board of Regents and as the chancellor of the
Smithsonian Institution. • Supervises the acquisition of books for the
Law Library of the
Library of Congress. Unlike Senators and Representatives, who are constitutionally prohibited from holding any other "office of trust or profit" of the United States or of any state while holding their congressional seats, the chief justice and the other members of the federal judiciary are not barred from serving in other positions. John Jay served as a diplomat to negotiate the
Jay Treaty, and
Earl Warren chaired
the President's Commission on the Assassination of President Kennedy.
Disability or vacancy Under , when the chief justice is unable to discharge their functions, or when that office is vacant, the chief justice's duties are carried out by the senior associate justice until the disability or vacancy ends. When
William Rehnquist was ill in 2004,
John Paul Stevens acted in his stead, presiding over oral arguments. Currently,
Clarence Thomas is the senior associate justice. ==List of chief justices==