14/05/2026
Pangilinan v. Cayetano and the Uncharted Waters of ICC Cooperation: Why the Supreme Court Must Do More Than What It Has Already Said
By Atty. Arbie C. Buenaflor
During a recent discussion among fraternity brothers on the legal controversy surrounding former President Rodrigo Duterte and Senator Ronald "Bato" Dela Rosa, one brother advanced a position that deserves serious engagement: that Pangilinan v. Cayetano (G.R. No. 238875, March 16, 2021) already provides sufficient guidance on the enforcement of International Criminal Court (ICC) arrest warrants in the Philippines, rendering further judicial intervention unnecessary. The view is sincere and not entirely without foundation. But with respect, I must disagree.
Pangilinan v. Cayetano touched only the tip of the iceberg. And here is the deeper problem that my fraternity brother's position does not confront: the very passages in that decision that speak to the Philippines' duty to cooperate with the ICC are not ratio decidendi. They are obiter dictum. Things said in passing. They do not bind. They do not govern. And they cannot substitute for the clear, enforceable framework that the present constitutional crisis demands.
The chaotic scenes of May 2026, with National Bureau of Investigation agents pursuing Senator Dela Rosa through the corridors of the Senate, and the Supreme Court withholding a temporary restraining order while the nation watched in bewilderment, are proof enough that what the Court said in 2021 was far from sufficient.
1. Pangilinan v. Cayetano: What the Court Decided, and What It Merely Said
The Supreme Court in Pangilinan v. Cayetano dismissed the consolidated petitions challenging the Duterte administration's unilateral withdrawal from the Rome Statute. The ground was mootness: by the time the petitions were decided, the Philippines had already completed its withdrawal, the ICC had acknowledged it, and the one-year waiting period under Article 127(1) of the Rome Statute had long lapsed. That dismissal on mootness is the ratio decidendi of the case. It is the only part of the ruling that carries binding precedential force under Philippine doctrine.
Yet the Court's lengthy decision contained a great deal more than its dispositive portion. In its extended discussion, the Court declared that even if the Philippines had deposited its instrument of withdrawal, it shall not be discharged from any criminal proceedings already initiated before the ICC, and that whatever process was already commenced obliges the state party to cooperate. This language has been widely cited, including by the Senate in its July 22, 2021 press release, as evidence that the Philippines retains a continuing duty to cooperate with the ICC for crimes committed during the period of membership.
The problem, however, is one of basic doctrine. Because the Court dismissed all three consolidated petitions on the ground of mootness, that dismissal is the ratio decidendi of the case, the only part of the ruling that carries binding precedential force. Everything else in the decision, including the cooperation language, however carefully reasoned and however widely quoted, occupies the inferior status of obiter dictum. Under settled Philippine jurisprudence, obiter dicta do not bind future courts and cannot be cited as controlling precedent.
This distinction is not a technicality. It is the very heart of the problem. My fraternity brother's argument that Pangilinan is enough rests on language that, under settled Philippine jurisprudence, does not legally compel anything. When the next administration decides to resist an ICC warrant, or when a senator takes refuge in the Senate building, no court in the land is obligated to follow what was said on page 87. That is precisely why the iceberg metaphor is apt. The Court showed us its surface. The mass beneath remains uncharted.
2. The Legal Vacuum and Its Constitutional Consequences
The absence of binding doctrine on ICC cooperation is compounded by the absence of any enabling domestic legislation. The Philippines' withdrawal from the Rome Statute in 2019 extinguished whatever treaty-based procedural framework once governed ICC requests for assistance. What remains is insufficient. Presidential Decree No. 1069, the Philippine Extradition Law of 1977, governs the surrender of persons to foreign states pursuant to bilateral extradition treaties. It does not contemplate surrender to an international tribunal. The 2025 Rules on Extradition Proceedings (A.M. No. 22-03-29-SC), promulgated by the Supreme Court on April 8, 2025 and effective November 10, 2025, likewise address inter-state extradition and do not fill this gap.
Republic Act No. 9851, the Philippine Act on Crimes Against International Humanitarian Law, Genocide, and Other Crimes Against Humanity, is the closest domestic analog to an ICC cooperation statute. Its Section 17 allows Philippine authorities to defer to another court or international tribunal already conducting a prosecution. The Department of Justice invoked this provision as the legal basis for Duterte's surrender in March 2025 and cited it again in connection with the Dela Rosa warrant.
But RA 9851 is a penal statute, not a procedural one. It defines crimes and assigns penalties. It establishes no process by which an ICC arrest warrant is received, reviewed, validated, or challenged before a Philippine court. Senator Dela Rosa's counsel, Atty. Israelito Torreon, was correct when he argued that the Philippines possesses no equivalent of Germany's Gesetz ueber die Zusammenarbeit mit dem Internationalen Strafgerichtshof, Canada's Crimes Against Humanity and War Crimes Act, or the Netherlands' International Crimes Act, each of which establishes comprehensive domestic procedures for ICC cooperation.
The consequences of this vacuum are no longer theoretical. The NBI's attempted service of the Dela Rosa warrant within Senate premises on May 11, 2026, without any prior judicial authorization, raised immediate due process concerns. Dela Rosa's counsel argued that constitutional safeguards require a local judicial determination of probable cause before a Filipino citizen may be surrendered to a foreign tribunal. The Supreme Court on May 13, 2026 declined to issue a temporary restraining order, directing parties to file comments instead. That restraint was procedurally defensible. But it left enforcement personnel, the respondents, and the public without a single clear rule to follow.
3. The Imperative for Binding Supreme Court Guidelines
The preferred solution is congressional legislation. A Philippine ICC Cooperation Act would authoritatively specify how ICC arrest warrants are received and transmitted, what domestic judicial process must precede enforcement, what rights the accused may invoke, and how law enforcement agencies coordinate with the ICC. Congress has the plenary power to provide this architecture, and the rule of law demands that it do so. Given, however, the present political composition of Congress and its demonstrated unwillingness to address ICC cooperation directly, legislation is not a near-term prospect.
In that legislative silence, the Supreme Court is both positioned and obligated to act. Under Article VIII, Section 5(5) of the 1987 Constitution, the Court holds exclusive authority to promulgate rules concerning the protection and enforcement of constitutional rights, pleading, practice, and procedure in all courts. This power is not shared with the executive or legislative branches. The Court has exercised it boldly before: the Writ of Amparo, the Writ of Habeas Data, and most recently the 2025 Rules on Extradition Proceedings were all born of this authority. The analogy is instructive.
If the Court found it necessary to promulgate rules for extradition proceedings involving foreign states, there is no principled reason it should hesitate to promulgate rules for the analogous and more constitutionally fraught process of ICC warrant enforcement.
Crucially, the obiter dictum in Pangilinan v. Cayetano on the Philippines' cooperation obligations, while not binding as precedent, is not without value. It signals the institutional orientation of the Court on this question. Transforming that orientation into binding procedural rules would be entirely consistent with the Court's own prior statements, would give legal force to what remains only persuasive, and would fulfill rather than exceed the Court's constitutional role. The argument is not that the Court should legislate. It is that the Court should govern its own processes, as it is constitutionally empowered to do.
At a minimum, Supreme Court guidelines should resolve the following: whether a domestic judicial finding of probable cause is a prerequisite to the enforcement of an ICC arrest warrant; the proper venue and procedural timeline for challenging such warrants before Philippine courts; the respective roles of the Department of Justice, the National Bureau of Investigation, and the Philippine National Police in processing ICC cooperation requests; and whether legislative or senatorial immunity extends to shield members of Congress from ICC-issued process. Without resolution of these questions by binding rule, each successive warrant will ignite a fresh constitutional emergency, and the rule of law will remain at the mercy of political circumstance.
CONCLUSION
My fraternity brother is right that Pangilinan v. Cayetano matters. He is wrong that it is enough. The decision's most consequential passages on the duty to cooperate with the ICC were written in the register of obiter dictum. They are persuasive. They are not precedential. They illuminate the surface of a legal problem whose depth the Court has not yet plumbed. In the meantime, former presidents are arrested at airports, senators flee through Senate corridors, and the nation watches a constitutional crisis unfold without a rulebook.
It must be said plainly: this essay, like my fraternity brother's argument, is ultimately one person's reasoned opinion on a question that no private analysis can authoritatively resolve. Legal scholars, practitioners, and observers across the country have weighed in, and will continue to weigh in, each from the vantage point of his or her own reading of the Constitution, the statutes, and the treaties at play.
We are, all of us, observers standing at the water's edge as history moves beneath the surface. The arguments here are offered in that spirit, with the full awareness that intellectual honesty requires acknowledging their limits.
What cannot be doubted is where the authority to settle this matter ultimately rests. The Supreme Court will rule on Senator Dela Rosa's pending petition. That ruling will carry binding force on the facts before it, and it will matter enormously. But a single case-specific ruling is not a framework. The next ICC warrant against a fourth respondent, or a fifth, will arrive without a rulebook unless the Court takes the further step of promulgating general procedural guidelines under its rule-making power in Article VIII, Section 5(5) of the 1987 Constitution. Congress, for its part, has shown no appetite to fill this void through legislation, and wishful thinking cannot substitute for political will.
In the absence of legislation, only the Supreme Court, as the final guardian of constitutional order and the institution the Filipino people have entrusted with the resolution of exactly these kinds of foundational disputes, possesses the authority, the institutional wisdom, and the constitutional mandate to bring clarity to this question. We may argue, analyze, and disagree. But we cannot decide. That solemn power belongs to the Supreme Court alone. And so we watch, and we wait, and we hope that the beacon holds.
