Here's a look at Supreme Court nominations.
Under Article II of the Constitution, the President nominates justices to the Supreme Court, with the "advice and consent of the Senate."
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If a vacancy occurs when Congress is not in session, a recess appointment allows an appointee to serve without Senate approval until Congress reconvenes.
One hundred and sixty-three nominations have been submitted to the Senate (including nominations for chief justice). Of those, there have been 126 confirmations, with seven instances of individuals declining to serve.
The American Bar Association's Standing Committee on the Federal Judiciary evaluates all nominees to the Supreme Court for the Justice Department and the Senate Judiciary Committee. The organization has three possible rankings: qualified, well-qualified, and not qualified.
There is no requirement that the chief justice of the Supreme Court previously serve as an associate justice, but five of the 17 chief justices have. Three justices served on the Court immediately before being elevated to chief justice: Edward D. White, Harlan Fiske Stone and William Rehnquist. Two justices had a break between their service as associate justice and being appointed chief justice: Charles Evans Hughes and John Rutledge.
Franklin D. Roosevelt appointed nine justices during his 12-year presidency, the most since George Washington. Jimmy Carter is the only US president to complete a full term of office and never have the opportunity to nominate a justice.
1952 - Presidents begin consulting the American Bar Association before making Supreme Court nominations.
1950s - President Dwight D. Eisenhower makes recess appointments of Earl Warren, Potter Stewart and William J. Brennan. All three are later confirmed by the Senate.
1955 - Nominees begin appearing before the Senate Judiciary Committee for confirmation hearings.
1981 - Senate Judiciary Committee Hearings are televised for the first time.
1987 - Nominee Robert Bork is rejected by the Senate. Anthony Kennedy takes the seat.
March 22, 2001 - The Bush Administration announces it will not consult with the ABA before judicial candidates are formally nominated. The administration says it is concerned about the ABA's semi-official role in the process.
October 3, 2005 - John Roberts is sworn in as chief justice of the United States, replacing Rehnquist, who died on September 3.
October 27, 2005 - Harriet Miers withdraws her Supreme Court nomination.
August 8, 2009 - Sotomayor is sworn in as the 111th Supreme Court Justice.
May 10, 2010 - President Barack Obama nominates Solicitor General Elena Kagan to fill the seat of retiring Justice John Paul Stevens.
August 7, 2010 - Kagan is sworn in as the 112th Supreme Court Justice.
February 1, 2017 - President Donald Trump nominates Judge Neil Gorsuch to replace Scalia.
April 7, 2017 - The US Senate confirms Gorsuch (54-45) as an associate justice.
April 10, 2017 - Gorsuch is sworn in as the 113th Supreme Court Justice.
July 10, 2018 - Trump nominates Brett Kavanaugh to fill the seat of retiring Justice Kennedy.
October 6, 2018 - Kavanaugh wins Senate confirmation by the narrowest margin in 137 years, in a 50-48 vote. In 1881, Stanley Matthews was confirmed by the Senate in a 24-23 vote. Kavanaugh is administered the official Constitutional Oath and Judicial Oath by Chief Justice Roberts and retired Justice Kennedy shortly after being confirmed by the Senate, while the ceremonial swearing-in event takes place at the White House on October 8.