A constitutionally recognized officer of the Senate who presides over the chamber in the absence of the vice president. The president pro tempore (or, "president for a time") is elected by the Senate and is, by custom, the senator of the majority party with the longest record of continuous service. This index page provides links to information on the origins and authority of the office and the pro tempore's role in presidential succession.
Origins and Development
Constitutional Authority Article 1, section 3
President Pro Tempore Briefing: Constitutional Authority
Powers & Procedure
Presidents Pro Tempore
Related Links President of the Senate