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President pro tempore of the United States Senate
The president pro tempore of the United States Senate (often shortened to president pro tem) is the second-highest-ranking official of the United States Senate, after the vice president. According to Article One, Section Three of the United States Constitution, the vice president of the United States is the president of the Senate (despite not being a senator), and the Senate must choose a president pro tempore to act in the vice president's absence.
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