EXPLAINER: Understanding Rule 18 - What the Ligutan Facebook Controversy Actually Means

By Marcial Bonifacio

8/14/26

My friends and countrymen, this is an explainer for Vice President Sara Duterte's impeachment trial, for which case I made in The Case for the conviction of Vice President Sara Duterte. For a moment on the fifteenth day of Vice President Sara Duterte's impeachment trial, a single Facebook post from a lawyer, one with no seat on the bench and no witness stand to answer from, threatened to become the day's biggest story. House private prosecutor Amando Virgil Ligutan posted a general statement about courtroom procedure. The defense called it a violation of Rule 18. The presiding officer promised a formal ruling. Before any citizen judges whether a Facebook post can derail a trial of this magnitude, the rule itself deserves a plain explanation.

What Rule 18 Actually Says

Rule 18 of the Senate's impeachment rules prohibits senators, House prosecutors, defense counsels, private counsels, and witnesses from making public comments or disclosures about the merits of a pending impeachment trial. In plainer terms, everyone with a formal role in the trial is barred from arguing their case anywhere except inside the Senate chamber itself. This is a version of what Philippine law more broadly calls the sub judice rule, a principle that prohibits public commentary on matters still awaiting a court's judgment, precisely so that public opinion, media pressure, or courtroom theater performed outside the courtroom cannot substitute for the evidence and arguments a tribunal is supposed to weigh on its own.

This is a concern the American founders themselves anticipated, long before Facebook existed to test it. Alexander Hamilton, writing in Federalist No. 65 in 1788 to defend the Constitution's design for trying impeachments, warned that such trials would rarely be decided on evidence alone, since the charges almost always touch matters that divide the public into rival camps before a single witness testifies. Hamilton's fear was that the accused's fate would turn on the comparative strength of the two parties rather than a fair demonstration of guilt or innocence, with the community choosing sides long before the tribunal rendered its verdict. Rule 18 answers a version of the same fear Hamilton raised two centuries earlier: that a trial conducted partly in public argument, rather than wholly within the chamber built to weigh it, ceases to be a trial in any meaningful sense at all.

The purpose is straightforward. A trial's integrity depends on the judges deciding the case based on what happens inside the proceeding, not on what lawyers post to their followers while the gavel is still in session. Impeachment court spokesperson Regie Tongol, addressing a separate Rule 18 controversy earlier in this same trial, put the principle plainly: senator-judges "are even more covered" by the rule than the lawyers arguing before them, since impeachment is inherently a political process, and any appearance that a judge has already formed an opinion risks damaging public confidence in the verdict itself.

What Actually Happened on Day 15

The controversy began during a heated cross-examination exchange between private prosecutor Lorna Kapunan and defense counsel Kristine Ferrer, in which Ferrer appeared to argue that misleading questions were permissible during cross-examination. At 11:29 that morning, Ligutan posted to Facebook a reminder that "misleading questions are not allowed even in cross-examination."

Lead defense counsel Sheila Sison raised the issue in a formal manifestation before the court, arguing the post mischaracterized Ferrer's courtroom position, disrespected a fellow member of the bar, and violated Rule 18's ban on public commentary about the case's merits. Ligutan defended himself to reporters afterward, saying his post named no one and referenced no case, and that he was confident he knew exactly where the line was and had not crossed it.

Presiding Officer Francis Escudero did not rule from the bench. He told the floor that he had directed the clerk of court to monitor counsels' public statements throughout the week, and observed that one side had been "crossing the line many, many times." He promised a formal ruling, warning, and order at the next trial date.

This Was Not the First Time

Weeks earlier, in June, Senator Robin Padilla, one of the senator-judges hearing the case, posted on Facebook defending his own courtroom questions about the authenticity of video evidence presented at trial. Tongol, the court spokesperson, confirmed that senator-judges are bound by Rule 18 as well, and warned that public statements suggesting bias could undermine confidence in the court's eventual decision. The Ligutan controversy is therefore not an isolated incident but the second public test of the same rule within a single trial, a pattern worth watching as the proceedings continue.

Two Honest Perspectives

Those who see merit in the defense's complaint argue that the timing and content of Ligutan's post make its target obvious even without naming names. A statement about misleading cross-examination questions, posted minutes after a public exchange in which the defense had just argued the opposite position, functions as public commentary on the case regardless of whether a name appears in the text. Under this reading, Rule 18 exists precisely to prevent lawyers from litigating their case in the court of public opinion between recesses, and a technical absence of names does not cure that.

Those unpersuaded by the complaint counter that Rule 18, as written, prohibits comment on the merits of the case, meaning the underlying facts, the guilt or innocence of the Vice President, the strength of the evidence, not general statements of settled legal principle. Representative Terry Ridon made this argument directly, asking whether the post named a person or discussed the case's merits and concluding it did neither. Under this reading, a lawyer restating a rule every law student learns in evidence class is teaching, not litigating, and treating every adjacent public statement as a Rule 18 violation would leave lawyers unable to discuss the law at all while a trial is ongoing.

Both readings rest on a genuine ambiguity in the rule itself: whether "the merits" means only direct commentary on guilt or innocence, or extends to any public statement whose obvious context relates to a specific courtroom dispute. Presiding Officer Escudero's own choice to draft a formal ruling rather than decide the matter immediately suggests the ambiguity is real enough to deserve careful resolution rather than a snap judgment from the bench.

Why This Matters Beyond the Courtroom

A citizen with no interest in impeachment law might reasonably ask why a lawyer's Facebook post deserves this much attention. The answer lies in a broader principle that touches every Filipino who has ever followed a court case in the news, or discussed one with a neighbor. Sub judice rules exist because trials are supposed to be decided by evidence presented and tested inside a courtroom, not by whichever side manages to dominate public conversation while the case is pending. The same principle that restrains Ligutan restrains a barangay official commenting publicly on a pending case against a political rival, or a company executive posting about ongoing litigation involving a competitor, or, for that matter, any citizen serving on a jury who might be tempted to discuss the case with family before a verdict is reached.

The Philippine Supreme Court took this principle seriously enough to formally rule, in a matter involving former Chief Justice Maria Lourdes Sereno, that a public official's campaign of public statements about her own pending case violated the same sub judice standard now at issue in Ligutan's post, showing that this is not a minor procedural nicety invented for this trial but an established doctrine with real consequences reaching all the way to the nation's highest court.

My friends and countrymen, whether one Facebook post crossed a legal line is, in the end, a narrower question than the principle it tests. The principle is this: that citizens are entitled to a verdict reached through evidence weighed in the open chamber, not through whichever lawyer's post gained the most shares before the next recess.

Long live the rule of law, and long live the Republic of the Philippines!