John Roberts in the context of "First inauguration of Donald Trump"

The oath of office of the president of the United States is the oath or affirmation that the president of the United States takes upon assuming office. The wording of the oath is specified in Article II, Section One, Clause 8, of the United States Constitution, and a new president is required to take it before exercising or carrying out any official powers or duties.

This clause is one of three oath or affirmation clauses in the Constitution, but it is the only one that actually specifies the words that must be spoken. Article I, Section 3 requires Senators, when sitting to try impeachments, to be "on Oath or Affirmation." Article VI, Clause 3, similarly requires the persons specified therein to "be bound by oath or affirmation, to support this Constitution." The presidential oath requires much more than that general oath of allegiance and fidelity. This clause enjoins the new president to swear or affirm: "I will to the best of my ability, preserve, protect and defend the Constitution of the United States."

Justice (abbreviation: [name], J. and other variations) is an honorific style and title traditionally used to describe a jurist who is currently serving or has served on a supreme court or some equal position. In some countries, a justice may have had prior experience as a judge or may have been appointed with no prior judicial experience. It is predominantly used today in the United States to distinguish those who serve on the U.S. Supreme Court from judges who serve on a lower court. Other countries, such as New Zealand and India, similarly use the title as a form of address for members of their highest courts.

The United States Judicial Panel on Multidistrict Litigation (J.P.M.L. or the Panel) is a special body within the United States federal court system which manages multidistrict litigation. It was established by Congress in 1968 by Pub. L. 90–296, and has the authority to determine whether civil actions pending in two or more federal judicial districts should be transferred to a single federal district court for pretrial proceedings. If such cases are determined to involve one or more common questions of fact and are transferred, the Panel will then select the district court and assign a judge or judges to preside over the litigation. The purpose of the transfer or "centralization" process is to conserve the resources of the parties and their counsel, as well as the judiciary, thus avoiding duplication of discovery and preventing inconsistent pretrial rulings.

The Chief Justice of the United States, currently John Roberts, appoints the members of the Panel, which is composed of no more than seven United States federal judges serving on either district courts or courts of appeals. All panel members must be from different judicial circuits. In addition to their participation on the Panel, the members continue to serve as judges for the courts to which they were originally appointed. The Panel convenes hearings in various locations around the country to facilitate the participation of parties and their counsel. The Office of the Clerk of the Panel is located at the Thurgood Marshall Federal Judiciary Building in Washington, D.C.

John Paul Stevens (April 20, 1920 – July 16, 2019) was an American lawyer and jurist who served as an associate justice of the Supreme Court of the United States from 1975 to 2010. At the time of his retirement, he was the second-oldest justice in the history of the U.S. Supreme Court and the third-longest-serving justice. At the time of his death in 2019 at age 99, he was the longest-lived Supreme Court justice ever. His long tenure saw him write for the Court on most issues of American law, including civil liberties, the death penalty, government action, and intellectual property. Despite being a registered Republican who throughout his life identified as a conservative, Stevens was considered to have been on the liberal side of the Court at the time of his retirement.

Born in Chicago, Stevens served in the United States Navy during World War II and graduated from Northwestern University School of Law. After clerking for Justice Wiley Rutledge, he co-founded a law firm in Chicago, focusing on antitrust law. In 1970, President Richard Nixon appointed Stevens to the United States Court of Appeals for the Seventh Circuit. Five years later, President Gerald Ford nominated Stevens to the Supreme Court to fill the vacancy caused by the retirement of Justice William O. Douglas. He became the senior associate justice after the retirement of Harry Blackmun in 1994. After the death of Chief Justice William Rehnquist in 2005, Stevens briefly served as acting Chief Justice before the appointment of John Roberts. Stevens retired in 2010 during the administration of President Barack Obama and was succeeded by Elena Kagan.