The legislature may convene a special legislative session as follows:
RCW 44.04.012
Finding- 2022 c 150 : "Article II, section 12 of the state Constitution provides that special legislative sessions may be convened by resolution of the legislature through an affirmative vote in both chambers of two-thirds of the members elected. Such vote may take place either during the legislative session or "during any interim between sessions in accordance with such procedures as the legislature may provide by law or resolution." The legislature finds that in order to act swiftly and effectively when the need for a special session arises during an interim, as well as preserve continuity of process, the procedures for calling itself into special session should be memorialized in law." [2022 c 150 s 1.]