Supporters of former Philippine president Rodrigo Duterte have falsely claimed the International Criminal Court (ICC) issued a statement saying it lacked jurisdiction over the Southeast Asian nation after the ex-leader was arrested for his brutal war on drugs.

The Philippine Senate said Monday it will conduct a formal probe of ex-president Rodrigo Duterte's arrest and swift handover last week to the International Criminal Court, which is to try him for alleged crimes against humanity.

Following a request from the International Criminal Court (ICC), the Philippines arrested former President Rodrigo Duterte due to an investigation into thousands of killings in a violent crackdown on drugs that was the hallmark of his rule.