Article I, Section 3 establishes the composition, qualifications, leadership, powers, and impeachment authority of the United States Senate. Originally adopted in 1788, portions of this section were later modified by the Seventeenth Amendment, ratified on April 8, 1913, which changed the method of selecting senators from appointment by state legislatures to direct election by the voters of each state. [1](https://www.archives.gov/milestone-documents/17th-amendment)[2](https://www.archives.gov/legislative/features/17th-amendment)[3](https://en.wikipedia.org/wiki/Seventeenth_Amendment_to_the_United_States_Constitution) ## Composition of the Senate The Senate consists of: - Two senators from each state. - One hundred senators total. - Equal state representation regardless of population. Unlike the House of Representatives, which is apportioned by population, every state receives equal representation in the Senate. --- ## Senate Terms Senators serve: - Six-year terms. - Staggered terms divided into three classes. - Approximately one-third of Senate seats are contested every two years. This system ensures continual institutional operation because the entire Senate is never elected simultaneously. --- ## Senator Qualifications Under Article I, Section 3, a senator must: - Be at least 30 years old. - Have been a United States citizen for at least nine years. - Be an inhabitant of the state represented at the time of election. --- ## Original Method of Selection (1788-1913) As originally written, Article I, Section 3 provided that senators were chosen by state legislatures rather than by direct public vote. State legislatures elected senators to six-year terms. [1](https://www.archives.gov/milestone-documents/17th-amendment)[2](https://www.archives.gov/legislative/features/17th-amendment) Under the original constitutional structure: **People → State Legislature → Senator** State governments exercised direct authority over Senate membership. --- ## Seventeenth Amendment Ratification (1913) The Seventeenth Amendment was proposed by Congress in 1912 and ratified on April 8, 1913. It amended Article I, Section 3 by requiring that senators be elected directly by the people of each state. [1](https://www.archives.gov/milestone-documents/17th-amendment)[2](https://www.archives.gov/legislative/features/17th-amendment)[3](https://en.wikipedia.org/wiki/Seventeenth_Amendment_to_the_United_States_Constitution) The amendment states: > "The Senate of the United States shall be composed of two Senators from each State, elected by the people thereof, for six years..." [3](https://en.wikipedia.org/wiki/Seventeenth_Amendment_to_the_United_States_Constitution)[1](https://www.archives.gov/milestone-documents/17th-amendment) Following ratification, the system became: **People → Senator** State legislatures no longer select United States senators. [1](https://www.archives.gov/milestone-documents/17th-amendment)[2](https://www.archives.gov/legislative/features/17th-amendment) --- ## Senate Vacancies The Seventeenth Amendment also revised vacancy procedures. When a Senate vacancy occurs through death, resignation, expulsion, or another cause, the executive authority of the state issues a writ of election. State legislatures may authorize governors to make temporary appointments until an election is held. [3](https://en.wikipedia.org/wiki/Seventeenth_Amendment_to_the_United_States_Constitution)[1](https://www.archives.gov/milestone-documents/17th-amendment) --- ## Vice President as President of the Senate Article I, Section 3 designates the Vice President of the United States as President of the Senate. The Vice President: - Is not a senator. - Normally does not participate in debate. - Votes only when the Senate is evenly divided. This tie-breaking authority can determine outcomes involving legislation, nominations, and procedural matters. --- ## President Pro Tempore The Senate elects a President Pro Tempore to preside when the Vice President is absent. The office: - Is established by Article I, Section 3. - Traditionally is held by the most senior member of the majority party. - Is included in the presidential line of succession established by federal statute. --- # Senate Powers ## Impeachment Trials Article I, Section 3 provides: > "The Senate shall have the sole Power to try all Impeachments." [4](https://www.law.cornell.edu/constitution-conan/article-1/section-3/clause-6)[5](https://www.senate.gov/about/powers-procedures/impeachment.htm) This creates a two-step impeachment process. ### House of Representatives The House: - Investigates allegations. - Adopts articles of impeachment by simple majority vote. - Possesses the sole power of impeachment under Article I, Section 2. [5](https://www.senate.gov/about/powers-procedures/impeachment.htm) Impeachment is a formal accusation and does not remove an official from office. ### Senate Following impeachment: - The Senate conducts a trial. - Senators hear evidence and arguments. - Senators vote on conviction or acquittal. --- ## Presidential Impeachment Trials When the President of the United States is tried, the Chief Justice of the United States presides over the Senate trial. [4](https://www.law.cornell.edu/constitution-conan/article-1/section-3/clause-6) The Constitution specifically requires the Chief Justice to preside in presidential impeachment trials. [4](https://www.law.cornell.edu/constitution-conan/article-1/section-3/clause-6) --- ## Conviction Requirement Article I, Section 3 requires: > "no Person shall be convicted without the Concurrence of two thirds of the Members present." [4](https://www.law.cornell.edu/constitution-conan/article-1/section-3/clause-6)[5](https://www.senate.gov/about/powers-procedures/impeachment.htm) If all 100 senators are present, 67 votes are required for conviction. Without a two-thirds vote, the accused official is acquitted and remains in office. --- ## Consequences of Conviction Upon conviction, the Senate may: - Remove an official from office. - Disqualify an individual from holding future federal office. The Constitution limits impeachment judgments to removal and disqualification. Criminal or civil proceedings remain separate matters outside the impeachment process. --- ## Confirmation Authority The Senate exercises advice-and-consent responsibilities for federal appointments. Senate confirmation is required for many federal officers, including: - Supreme Court justices. - Federal judges. - Cabinet secretaries. - Ambassadors. - Numerous executive branch officers. These powers arise from the constitutional structure created by Article I and Article II. --- ## Treaty Ratification The Senate participates in treaty ratification. International treaties negotiated by the President require Senate approval by a two-thirds vote of senators present before ratification may occur. This authority derives from Article II, Section 2 and is exercised by the Senate established under Article I, Section 3. --- ## Investigations and Oversight Senate committees conduct investigations and oversight activities related to: - Federal agencies. - Executive branch operations. - Federal expenditures. - Public administration. Committees may hold hearings, gather evidence, and issue subpoenas under congressional investigative authority. --- # Constitutional Significance Since the ratification of the Seventeenth Amendment in 1913, the Senate has continued to operate under Article I, Section 3 while senators are elected directly by the voters of each state rather than by state legislatures. [1](https://www.archives.gov/milestone-documents/17th-amendment)[2](https://www.archives.gov/legislative/features/17th-amendment)[3](https://en.wikipedia.org/wiki/Seventeenth_Amendment_to_the_United_States_Constitution) Together, Article I, Section 3 and the Seventeenth Amendment establish: - Equal state representation in the Senate. - Direct election of senators. - Six-year staggered terms. - Procedures for vacancies. - Senate leadership positions. - The Senate's role in impeachment trials. - Advice-and-consent authority over nominations. - Participation in treaty ratification. - Ongoing legislative oversight and investigations.