the bureau of immigration acts as the primary enforcement arm of the department of justice and the president of the philippines in ensuring that all foreigners within its territorial jurisdiction comply with existing laws. it assists local and international law enforcement agencies in securing the tranquility of the state against foreigners whose presence or stay may be deemed threats to national security, public safety, public morals and public health and acts as chief repository of all immigration records pertaining to entry, temporary sojourn, admission, residence and departure of all foreigners in the country.