Although the president pro tempore is not the only state senator that can serve as a presiding officer, he holds the power to assign the presiding officer in his absence. During session, the presiding officer controls the flow of debate on the Oklahoma Senate floor, decides questions of order, seats the chamber, calls members to order for violating rules, and approves claims for supplies and services. He or she is responsible for maintaining decorum and enforcing the rules. The lieutenant governor presides over session in ceremonial instances such as the governor's State of the State speech. On the floor of the Oklahoma Senate, the presiding officer is always addressed as "Mister President" regardless of whether or not he is in fact the senate president or president pro tempore.