President Pro Tempore Law and Legal Definition

President Pro Tempore is a term used to refer the senator who presides over the Senate when the vice-president is not there. The term means president for the time being or a person acting as president temporarily. President Pro Tempore is also referred to as president Pro tem. S/he is the second-highest-ranking official of the U.S. Senate and presides over the session of the Senate in the absence of the vice-president. The President pro tempore is elected by the Senate and is usually the most senior senator in the majority party.