a. The Division of Pensions and Benefits in the Department of the Treasury shall reenroll in the Public Employees' Retirement System, established pursuant to P.L. 1954, c.84 (C.43:15A-1 et seq.), any person holding elective public office on the effective date of this act, P.L. 2017, c. 344, who was a member of the retirement system as of the effective date of sections 1 through 19 of P.L. 2007, c. 92(C.43:15C-1 through C.43:15C-15, C.43:3C-9, C.43:15A-7, C.43:15A-75 and C.43:15A-135) on the basis of holding an elective public office and who was elected to another elective public office after that effective date, provided the person has at least 15 years of continuous service in elective public offices of this State. The person shall be eligible for membership in the retirement system based on service in another elective office pursuant to sections 7 and 75 of P.L. 1954, c.84 (C.43:15A-7 and C.43:15A-75), or section 1 of P.L. 1972, c.167 (C.43:15A-135), as amended by P.L. 2017, c. 344. This reenrollment provision shall include any person holding elective public office on the effective date of this act, P.L. 2017, c. 344, who is receiving a retirement allowance from the retirement system on that effective date. For the purposes of this section, a person shall be deemed to have met the requirement for holding elective public office on the effective date of this act, P.L. 2017, c. 344, if the person's term of office expired within 30 days before that effective date. As of the date of enrollment in the system, the elected official's participation, if any, in another State-administered retirement program on the basis of that elective public office shall be suspended. The elected public official may elect to waive enrollment in the Public Employees' Retirement System by signing a form prepared by the division.