The dynamics of the Republic of the Philippines membership in the International Criminal Court began when President Joseph Ejercito Estrada took the step to ratify the Rome Statute. The ratification process was stopped by President Gloria Macapagal Arroyo during her reign. Afterwards, the Rome Statute ratification was successfully completed by President Benigno Simeon Aquino III on August 30, 2011, and the Philippines officially became the State Parties to the Rome Statute under his administration. However, on 17th March 2019, President Rodrigo Roa Duterte withdrew the Philippines from its membership in the ICC. President Duterte’s leadership pattern is influenced by the Left ideology and Socialism perspective, uphold equality and anti-discrimination, and synonymous with violence. By using his leadership pattern, President Duterte is trying to overcome the Philippines internal threat in the form of the high number of the drug user and dealer in the Philippines, as well as to overcome the Philippines external threat in the form of the condemnations that come from the ICC and the Western countries due to the “War on Drugs” campaign enforcement that aims to overcome its internal threat. This study is conducted to find out how President Duterte’s leadership pattern impacts on the RP withdrawal from the ICC. This research is using Graham T Allison’s Rational Actor Model (RAM) concept, which explains the relationship between the personal character of the policy maker with his country foreign policy. This research uses the qualitative method with the descriptive analysis that is formed from the primary and secondary data, obtained from the books, official websites, journals, interviews, related articles, newspapers, and other reliable sources. In this research, the author also adds the discussion regarding the Islamic views that is related to the case study. By using the concept of RAM, the author concludes that the change of the Philippines foreign policy in the form of the Philippines withdrawal from the ICC is the rational choice made by President Duterte as the policy maker based on his perceptions on the ICC, in which his perceptions are created by his leadership pattern.