PROVINCE OF SULU, DULY REPRESENTED BY ITS GOVERNOR, ABDUSAKUR A. TAN II, PETITIONER, PHILIPPINE ASSOCIATION OF ISLAMIC ACCOUNTANTS [PAIA], INC., REPRESENTED BY ITS PRESIDENT, AMANODING D. ESMAIL, CPA, ET AL.; GOVERNOR ESMAEL G. MANGUDADATU, ET AL.; AND ALGAMAR A. LATIPH, ET AL., PETITIONERS-IN-INTERVENTION; VS. HON. SALVADOR C. MEDIALDEA, IN HIS CAPACITY AS EXECUTIVE SECRETARY; HONORABLE EDUARDO M. AÑO, IN HIS CAPACITY AS OFFICER-IN-CHARGE OF THE DEPARTMENT OF INTERIOR AND LOCAL GOVERNMENT; THE HONORABLE SENATE OF THE PHILIPPINES; THE HONORABLE HOUSE OF REPRESENTATIVES; THE HONORABLE COMMISSION ON ELECTIONS; HONORABLE JESUS G. DUREZA, IN HIS CAPACITY AS SECRETARY OF THE OFFICE OF THE PRESIDENTIAL ADVISER ON THE PEACE PROCESS; BANGSAMORO TRANSITION COMMISSION; AND MORO ISLAMIC LIBERATION FRONT, RESPONDENTS