manila philippines top police chief oversee bloody war drug kill thousands filipinos hint monday possible run presidency ronald dela rosa stocky celebrity-like general nickname bato rock retire 2018 flag political ambition say open run senate speech flag raise ceremony police headquarter dela rosa first time publicly suggest may sight set high political goals wait bato become president quadruple salaries dela rosa tell men deny rumor would leave retire plan salary increase dela rosa among tout national media duterte possible successor 2022 along world box champion senator manny pacquiao son namesake late philippine dictator ferdinand marcos dela rosa act enforcer firebrand leader war drug lead 3,900 people kill 16 months campaign spark outrage abroad domestic poll show crime-weary filipinos largely supportive measure duterte order police month halt activities war drug leave operations drug enforcement agency amid unprecedented scrutiny police conduct police reject allegations activists execute suspect drug users dealers say victims anti-narcotics operations kill arm violently resist arrest philippines police chief hint possible run presidency