Section 3. Clause 1. [The Senate of the United States shall be composed of two Senators from each State, chosen by the legislature thereof, for six Years; and each Senator shall have one vote].
Clause 1. Composition and Selection
Clause 1. [The Senate of the United States shall be composed of two Senators from each State, chosen by the legislature thereof, for six Years; and each Senator shall have one vote].
Clause 2. Classes of Senators
Clause 2. Immediately after they shall be assembled in Consequence of the first Election, they shall be divided as equally as may be into three classes. The Seats of the Senators of the first Class shall be vacated at the Expiration of the second Year, of the second Class at the Expiration of the fourth Year, and of the third Class at the Expiration of the sixth Year, so that one third may be chosen every second Year,
Clause 1 has been completely superseded by the Seventeenth Amendment, and Clause 2 has been partially superseded.
Clause 3. Qualifications
Clause 3. No Person shall be a Senator who shall not have attained to the Age of thirty Years, and been nine Years a Citizen of the United States, and who shall not, when elected, be an Inhabitant of that State for which he shall be chosen.
Clause 4. The Vice President
Clause 4. The Vice President of the United States shall be President of the Senate but shall have no Vote, unless they be equally divided.
Clause 5. Officers
Clause 5. The Senate shall chuse their other Officers, and also a President pro tempore, in the absence of the Vice President, or when he shall exercise the Office of the President of the United States.
The Supreme Court has not interpreted these clauses.
Clause 6. Trial of Impeachments
Clause 6. The Senate shall have the sole Power to try all Impeachments. When sitting for that Purpose, they shall be on Oath or Affirmation. When the President of the United States is tried, the Chief Justice shall preside: And no Person shall be convicted without the Concurrence of two thirds of the Members present.
Clause 7. Judgments on Impeachment
Clause 7. Judgment in Cases of Impeachment shall not extend further than to removal from Office, and disqualification to hold and enjoy any Office of honor, Trust or Profit under the United States; but the Party convicted shall nevertheless be liable and subject to Indictment, Trial, Judgment and Punishment, according to Law.
See analysis of impeachment under Article II, sec. 4.