California Code, Government Code - GOV § 9921

The Senate and Assembly shall adopt rules for their joint proceedings for each regular and special session by resolution adopted by an affirmative recorded vote of two thirds of the membership of each house. No joint rule so adopted may be amended except by resolution adopted by an affirmative recorded vote of two thirds of the membership of each house. The Senate and Assembly may provide for temporary suspension of a joint rule by a single house upon the affirmative recorded vote of two thirds of the members of that house; provided, that the temporary suspension shall apply only to the matter under immediate consideration, and in no case shall it extend beyond an adjournment.