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; and if vacancies happen, by resignation or otherwise, during the recess of the legislature of any State, the executive thereof may make temporary appointments until the next meeting of the legislature which shall then fill such vacancies. 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. The Vice-president of the United States shall be president of the Senate, but shall have no vote, unless they be equally divided. The Senate shall choose their other officers, and also a president _pro tempore_, in the absence of the Vice-president, or when he shall exercise the office as President of the United States. 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. 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. SEC. 4.--The times, places, and manner of holding elections for senators and representatives shall be prescribed in each State by the legislature thereof; but the Congress may, at any time, by law, make or alter such regulations, except as to the places of choosing senators. The Congress shall assemble at least once in every year; and such meeting shall be on the first Monday in December, unless they shall by law appoint a different day. SEC. 5.--Each house shall be the judge of the elections, returns, and qualifications of its own members; and a majority of each shall constitute a quorum to do business; but a smaller number may adjourn from day to day, and may be authorized to compel the attendance of absent members, in such manner and under such penalties as each house may provide. Each house may determine the rules of its proceedings, punish its members for disorderly behavior, and, with the concurrence of two thirds, expel a member.