 The state legislature may be called into special session by a written call signed by two-thirds of the members of the Oklahoma Senate and two-thirds of the members of the Oklahoma House of Representatives.Once conditions are met, the call is filed with the president pro tempore and the speaker who must issue a join order for the convening of the special session.According to Section 16 of Article Six of the Oklahoma Constitution, the president pro tempore is second in the gubernatorial line of succession behind the lieutenant governor.