This is the presiding officer of the senate who is from the majority party and who serves as the leader when the vice-president of the united states is absent.

President Pro Tempore.

Explanation:

The term 'pro tempore' in Latin means 'for a temporary time or period.'

President Pro Tempore is a high ranking senator in the U.S senate who takes over the work of senator in the absence of vice-president of the United States for a temporary period. The office of President Pro Tempore was established first in 1789 by the U. S. Constitution.

The first person to take the office of the president pro tempore in the U. S senate was John Langdon in 1789. According to the constitution of the U. S., President Pro Tempore is chosen by the Senate. The powers and authorities of a president pro tempore are limited.

So, the correct answer is President Pro Tempore.

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