Section 21Republic Act No. 296, otherwise known as the Judiciary Act of 1948, as amended, of Republic Act No. 9as amended, of the Rules of Court, and of all other statutes, letters of instructions and general o, Sec./Art. 21

Original jurisdiction in other cases. Regional Trial Courts shall exercise original jurisdiction:

(1) In the issuance of writs of certiorari, prohibition, mandamus, quo warranto, habeas corpus and injunction which may be enforced in any part of their respective regions; and

(2) In actions affecting ambassadors and other public ministers and consuls.