DAVAO CITY, Philippines -- (UPDATE - 12:53 p.m.) Davao City Mayor Rodrigo Duterte announced plans on Tuesday for a radical overhaul of the country's unitary system of government that would empower the provinces.

At the same time, the incendiary politician reiterated his vow of a relentless crackdown on crime after claiming a landslide presidential victory built on foul-mouthed populist tirades that exposed deep voter anger at the establishment.