Article II, Section 11

The Senate and House of Representatives, when assembled, shall each choose a speaker and its other officers; be judges of the qualifications and election of its members, and sit upon its own adjournments from day to day. Not less than two-thirds of all the members to which each house shall be entitled shall constitute a quorum to do business; but a smaller number may adjourn from day to day, and may be authorized, by law, to compel the attendance of absent members.