Idaho constitution
Article III
Section 8

(2) The legislature, while remaining a part-time, citizen legislature, must also be convened in special session by the president pro tempore of the senate and the speaker of the house of representatives upon receipt of a joint written petition of at least sixty percent of the membership of each house, specifying the subjects to be considered. Such special session must commence no later than fifteen days after the petition is received by the president pro tempore of the senate and the speaker of the house of representatives. At a special session convened pursuant to this section, the legislature shall have no power to consider or pass any bills or resolutions on any subjects other than those specified in the petition and those necessary to provide for the expenses of the session.