The Senate's second-in-command is a constitutional relic that holds the keys to succession.

The Senate's second-in-command is a constitutional relic that holds the keys to succession.
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In short: The President pro tempore is the third person in line for the American presidency, yet the role is largely ceremonial. While they are constitutionally empowered to preside over the Senate in the Vice President's absence, the position has evolved into an honorary title for the majority party's most senior member.

Established by the Constitution in 1789, the office of President pro tempore was designed to ensure the Senate had a presiding officer when the Vice President was unavailable. For much of the 19th century, the role held significant weight; between 1792 and 1886, the officeholder was second in the line of presidential succession. During periods when the vice presidency was vacant—which occurred ten times between 1812 and 1889—the President pro tempore became the next person in line for the White House.

The office's influence shifted dramatically over time. Removed from the line of succession in 1886, the position was restored in 1947, though it was placed behind the Speaker of the House. Today, the role is primarily held by the most senior senator of the majority party, a custom that solidified after 1945. Because the position is largely symbolic, the actual duty of presiding over daily Senate sessions is typically delegated to junior senators, allowing them to gain experience in parliamentary procedure.

Despite its ceremonial nature, the office retains critical constitutional and administrative functions. Under the 25th Amendment, the President pro tempore is one of two officials who must be notified if a president is unable to perform their duties. They also hold authority over certain congressional appointments, manage Senate building security, and serve as a legal recipient for key reports. While the salary for the role is $193,400—matching that of party leaders—the position remains a unique intersection of historical tradition and modern legislative management.

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