Former police chief Ronald Dela Rosa has been in hiding since May. (AFP pic)MANILA: Ex-Philippine president Rodrigo Duterte's top drug war enforcer said on Wednesday that a government bounty placed on his head put his life in "serious danger", and asked the Supreme Court to stop his arrest.

International Criminal Court (ICC) prosecutors have named sitting Senator Ronald "Bato" Dela Rosa as one of eight "co-perpetrators" in the drug crackdown that killed thousands of drug suspects and drug users during the Duterte presidency.

The former national police chief has been in hiding since May, when officers attempted to serve an ICC warrant charging him with the crime against humanity of murder.

The Philippines designated him last week as an "armed and dangerous" fugitive, offered a 50 million-peso ($786,000) reward for his capture, and formed a police task force to find and detain him.