Section 56Omnibus Election Code of the Philippines (Batas Pambansa Blg. 881), Sec. 56

Changes in the composition, distribution or assignment of field offices. - The Commission may make changes in the composition, distribution and assignment of field offices, as well as its personnel, whenever the exigencies of the service and the interest of free, orderly, and honest election so require: Provided, That such changes shall be effective and enforceable only for the duration of the election period concerned and shall not affect the tenure of office of the incumbents of positions affected and shall not constitute a demotion, either in rank or salary, nor result in change of status: and Provided, further, That there shall be no changes in the composition, distribution or assignment within thirty days before election, except for cause and after due notice and hearing, and that in no case shall a regional or assistant regional director be assigned to a region; a provincial election supervisor to a province; or a city or municipal election registrar to a city or municipality, where he and/or his spouse are related to any candidate within the fourth civil degree of consanguinity or affinity as the case may be.