The Vice President is considered the "President of the Senate", however the Vice President's only usual involvement is to swear in new senators, and break a tie vote if one occurs. The "President Pro Tempore" is the highest ranking Senator. It's usually (customary) the longest serving member of the majority party. Currently, Democratic Sen. Robert Byrd (West Virginia) is the President Pro Tempore. He has held office since January 3rd, 1959. He is the oldest member of the Senate. He is also the longest serving Senator is US history.
If Byrd dies or retires, Daniel Inouye (Hawaii) and Sen. Patrick Leahy (Vermont) would be the next two longest serving Senators on the Democratic side. The longest serving Republicans are Dick Luger (Indiana) and Orrin Hatch (Utah).
The President pro tempore
the president pro temp
The U.S. Vice President is the President of the Senate. When he/she is absent or acting as President, the Senate President Pro Tempore is in charge.
The 'President Pro Tempore' is the President of the Senate, when the Vice President of the United States is absent.
The president pro tempore presides over the Senate when the Vice President is absent. The current president pro tempore (as of 5/17) is Senator Orrin Hatch of Utah.
The Senate President Pro Tempore
When the US Vice President is absent or acting as President, his/her Senate duties fall to the US Senate President Pro Tempore, who by tradition is the longest-serving Senator of the majority party.
The Vice President of the United States is in charge of the U.S. Senate.
President Pro-Tempore
Present pro tempare
yes
If the vice-president is absent, some other senator, such are the pro tempore, presides over the Senate.
The treasurer will up hold the position