President pro tempore of the United States Senate

The President pro tempore of the United States Senate is one of the highest ranking official in the Senate. The current holder is Republican Charles Grassley.

Deceased

 * Richard Henry Lee (June 19, 1794)
 * Henry Tazewell (January 24, 1799)
 * Ralph Izard (May 30, 1804)
 * John Langdon (September 18, 1819)