California Code, Government Code - GOV § 9920

Each house of the Legislature shall adopt rules for its proceedings for each regular and special session by resolution adopted by an affirmative recorded vote of two thirds of the membership of the house in question. No rule of either the Senate or Assembly shall be amended except by resolution adopted by an affirmative recorded vote of two thirds of the Members of that house. Any standing rule of either house may be suspended temporarily by a vote of two thirds of the Members of that house present and voting; provided, that in no case may a rule be suspended in the absence of a quorum. Any such temporary suspension shall apply only to the matter under immediate consideration, and in no case shall it extend beyond an adjournment.