MANILA, PHILIPPINES - MAY 01:  Philippine presidential candidate Rodrigo Duterte gestures during a labor day campaign rally on May 1, 2016 in Manila, Philippines. Duterte, a tough-talking mayor of Davao in Mindanao has been the surprise pre-election poll favourite pulling away from his rivals despite controversial speeches and little national government experience. Opinion polls has shown Mr Duterte has maintained his lead with 33 percent support in the Philippines as Senator Grace Poe looks at impossible odds, with only 22 percent supporting her. The Philippine presidential campaign ends on May 7 with elections slated for May 9 and features 5 presidential candidates vying for the top post.  (Photo by Dondi Tawatao/Getty Images)