The Supreme Court of the United States is the highest court in the federal judiciary of the United States. The procedures of the Court are governed by the U.S. Constitution, various federal statutes, and its own internal rules. Since 1869, the Court has consisted of one chief justice and eight associate justices. Justices are nominated by the president, and with the advice and consent (confirmation) of the U.S. Senate, appointed to the Court by the president. Once appointed, justices have lifetime tenure unless they resign, retire, or are removed from office.