The president Pro-Tempore is the presiding officer in the senate. That individual is in charge of the Senate agenda in the absence of the vice president.
president pro tempore
The Vice President of the United States is the presiding officer in the Senate. It is only in the absence of the Vice President that the president pro tempore is empowered to preside.
== == == == the presiding officer in the senate is the vice president president of the senate
The vice president is the president of the Senate and has the tie-breaking vote, so when the vice president is not there, the Senate is typically presided over by the president pro tempore. The president pro tempore is a senator from the majority party and is elected by the Senate to serve as its presiding officer in the absence of the vice president.
Vice President
Viice presiident
vice president
vice president
the Vice President
Vice President
Vice President.