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Unlike the vice president, the president pro tempore is an elected member of the Senate, able to speak or vote on any issue. ... Since 1890, the most senior U.S. senator in the majority party has generally been chosen to be president pro tempore and holds the office continuously until the election of another.
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The president Pro Tempore is an elected US senator who unlike the vice president, can vote in the senate. He is usually the most senior senator from the majority party.

The US Senate

The United states Senate is the upper chamber of the US congress.

The lower chamber of congress is the house of representative. The vice president is the head of the senate by constitution.

The president pro tempore is usually the most senior senator of the majority party in the house. Unlike the vice president, he is elected and can participate in the senate activities.

Learn more about the US congress at https://brainly.com/question/779570

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