(UPDATE) NINE senators led by Sen. Alan Peter Cayetano have asked the Supreme Court to nullify the recent leadership change in the Senate, arguing that the move was carried out without a constitutionally required quorum and poses a serious threat to the chamber's independence as a coequal branch of government.
In an 87-page petition for certiorari and prohibition filed before the Court, the senators challenged the June 3 proceedings that led to Cayetano's removal as Senate president and the installation of a new Senate leadership, claiming the actions were unconstitutional and invalid.
The petition was filed by Sens. Alan Peter Cayetano, Loren Legarda, Pia Cayetano, Jinggoy Estrada, Bong Go, Rodante Marcoleta, Imee Marcos, Robin Padilla, and Camille Villar, together with private citizen and lawyer Jose Luis Montales, who was ousted as Senate secretary. It was not clear why Sens. Joel Villanueva and Mark Villar, who belonged to the Cayetano-led bloc, did not join the petition.
Named respondents were Sens. Bam Aquino, JV Ejercito, Francis Escudero, Sherwin Gatchalian, Risa Hontiveros, Panfilo Lacson, Lito Lapid, Francis Pangilinan, Vicente Sotto III, Erwin Tulfo, Raffy Tulfo, and Juan Miguel Zubiri, along with Senate Secretary Renato Bantug Jr. and Senate Sergeant-at-Arms Alfredo Corpus.
The petitioners asked the Supreme Court to exercise its expanded power of judicial review under Article VIII of the Constitution and issue a status quo ante order restoring conditions before the disputed Senate proceedings on June 3 while the case is being resolved.
At the center of the legal challenge is the claim that the Senate session during which the leadership transition occurred lacked a legal quorum, rendering all actions taken during the proceedings void.
"The Senate cannot effectively scrutinize executive actions, audit public expenditures, or guard civil liberties if its leadership serves at the pleasure, or under the shadow, of the executive," the petition stated.
But Lacson said Cayetano and his allies should have filed their petition to the Supreme Court much earlier so it would have enough time to study and rule on it.
"Disgraced ex-SP Cayetano should have done that earlier to give the Court sufficient time to study and rule on the issue now being raised before the Court. Instead, he chose to file it at the last minute or a day before the special session,” Lacson said.
"Is he trying to dig deeper in his bag of dirty tricks to create a scene tomorrow by invoking that pending action by the Supreme Court on his petition, [so that] he may still exercise his authority as Senate President?" Lacson said.
Constitutional question
The petitioners said the dispute transcends internal Senate politics and raises fundamental constitutional questions involving legislative independence, separation of powers, and the system of checks and balances.
The petitioners warned that allowing what they described as an "un-quorumed Senate minority" to reorganize the leadership of a coequal branch of government would undermine the Senate's institutional integrity and weaken its ability to serve as a check on executive power.
They also argued that the controversy is not shielded from judicial review by the political question doctrine, citing Supreme Court rulings that empower the judiciary to determine whether any branch or instrumentality of government committed a grave abuse of discretion.
Among the cases cited was the landmark 2003 ruling in Francisco v. House of Representatives, which affirmed the Court's authority to review actions of government branches when constitutional limits are allegedly breached.
The petition invoked lessons from the martial law era, asserting that the judiciary has a constitutional duty to intervene when allegations of abuse of power arise.
In a statement issued Tuesday, Cayetano defended the petition, rejecting suggestions that the case was motivated by a struggle for leadership positions.
"Truth is truth is truth. Numbers change. The Constitution does not," Cayetano said.
He said the petition seeks constitutional clarification on issues that could affect the Senate's independence and its ability to perform oversight functions, including ongoing investigations into alleged irregularities in government flood control spending.
"As the petition explains, this is not about a Senate leadership issue," Cayetano said. "Leadership positions are temporary stewardship. Leaders holding high government positions come and go. Political alliances change. Majorities rise and fall."
The senator argued that constitutional rules must remain paramount regardless of changing political alliances, warning that setting aside constitutional requirements for political expediency could weaken future legislative investigations and oversight efforts.
"The issue before the Supreme Court is therefore not merely legal. It is institutional," he said. "If constitutional rules can be disregarded whenever they become inconvenient, then every future investigation, every future oversight function, and every future effort to hold power accountable becomes vulnerable to the same treatment."
"The Supreme Court exists precisely for moments like this," Cayetano said. "Its role is not to choose sides in a political dispute but to determine whether the Constitution was followed."
'Dizzying rush'
The petitioners said Gatchalian called the session to order on the morning of June 3 with only 12 of the 24 senators physically present. The roll call showed no exclusions. Without explanation, Gatchalian declared a quorum, relying on the 1949 Supreme Court ruling in Avelino v. Cuenco, a decision the petitioners say has been gravely misinterpreted.
What followed, they argued, was a dizzying rush: a motion to declare all elective Senate positions vacant was approved “within seconds,” new officers were elected, committee chairmanships were redistributed, and the Senate was adjourned sine die — all in just 14 minutes.
“The rump session took all of 14 minutes from gavel to gavel,” the petition said. “Respondent senators did not take up the supposed legislative measures they themselves cited as the reason for convening a session.”
At the heart of the legal battle is the meaning of “a majority of each House” under Section 16(2), Article VI of the Constitution. With 24 senators, a majority is 13 — one more than half. Twelve, the petitioners said, is not a majority.
They said in Avelino, the Court recognized a quorum only after the Cuenco group had exhausted compulsory processes to compel attendance of absent senators, and only because some members were physically outside the Philippines and beyond the Senate’s coercive power. Here, none of those circumstances exist: no senator was abroad, no arrest orders were issued, and no effort was made to compel attendance before proceeding to legislative business.
The petitioners also invoked the Senate’s own precedent on May 5, 2015, when a quorum of 12 was declared only after excluding four senators who were out of the country and three who were under detention, leaving 17 “available” senators — making 12 a majority. That precedent, they said, cannot justify the June 3 session, where no such exclusions were made or documented.
The petition painted a wider picture of executive meddling. It pointed to the presence of Interior Secretary Jonvic Remulla at the Senate on June 4, where he was seen on video blocking Sens. Pia Cayetano and Padilla from entering a committee hearing — acts the petitioners say constitute crimes against popular representation under Articles 143 and 145 of the Revised Penal Code.
Impeachment trial
The petitioners warned that the leadership dispute directly imperils the pending impeachment trial of Vice President Sara Duterte. The Senate, when sitting as an impeachment court, is presided over by the Senate president, and its proceedings are administered by the secretary. If the authority of those officers is in doubt, every order, subpoena, and ruling issued in the trial could be rendered void.
“A senator usurping the office of the Senate president and thus of the presiding officer calling the impeachment court may mean that the impeachment court was not validly constituted and its proceedings void,” the petitioners said.
"Respondent senators are not even hiding the fact that their power play is animated towards managing in a certain way the impeachment trial of Vice President Sara Duterte," they said.
