Supreme Court Associate Justice Marvic Mario Victor Leonen has been sitting on the petitions of several senators and the Philippine Coalition for the International Criminal Courts (PCICC) questioning the decision of President Rodrigo Duterte to withdraw Philippine membership in the International Criminal Court (ICC) without Senate concurrence.

The case was raffled off to Leonen after it was filed on March 16, 2018, The Manila Times has learned from court documents it has obtained.