Final answer:
When a U.S. Supreme Court justice retires, the president nominates someone to fill the vacancy, and the Senate approves the choice.
Step-by-step explanation:
When a U.S. Supreme Court justice retired, the position will be filled by the president who nominates someone to fill the vacancy, and the Senate will then approve the choice. This process ensures that there is always a full Supreme Court bench. The president's nomination is subject to confirmation by the Senate, where a majority vote is required.
Learn more about U.S. Supreme Court Justice retirement and replacement