Philippines Presidential frontrunner and Davao City Mayor Rodrigo Duterte listens to questions from the press at a hotel in Davao City on the southern island of Mindanao on May 9, 2016. Anti-establishment firebrand Rodrigo Duterte was heading for a huge win in the Philippine presidential elections, according to a poll monitor, after an incendiary campaign dominated by his profanity-laced threats to kill criminals. / AFP PHOTO / NOEL CELIS