‘Sec. 15. Rulemaking regarding reporting by estranged spouse or domestic partner. The Commission on Governmental Ethics and Election Practices shall adopt rules to exclude from the definition of "immediate family," for purposes of income reporting pursuant to the Maine Revised Statutes, Title 1, section 1016-G and Title 5, section 19, an estranged spouse or domestic partner of a Legislator or an executive employee. Rules adopted pursuant to this section are routine technical rules as defined in Title 5, chapter 375, subchapter 2-A.’