Senate Rule S50-10. Attendance -- mandatory voting -- quorum. (1) Unless excused, Senators must be present at every sitting of the Senate and shall vote on questions put before the Senate.
(2) A majority of the Senate shall constitute a quorum to do business, but a smaller number may adjourn from day to day and compel the attendance of absent Senators, in the manner and under penalties as the Senate may prescribe (Montana Constitution, Art. V, sec. 10(2)).