THE GHOST OF SENATE PAST: Avelino v. Cuenco and how to break a deadlock

By Christian George Acevedo

The Senate “coup d’état” by the quorum of 12 senators, a.k.a. Solid Bloc 12, and the abrupt change in leadership on June 3, 2026, is one whole piece of political drama that stunned the nation. But a leadership coup is nothing new in Congress.

In 2019, for example, Pantaleon Alvarez was dramatically replaced by Gloria Macapagal Arroyo on the day of President Rodrigo Duterte’s SONA. This was often described as one of the most theatrical congressional coups — until today’s turn of events in the Senate.

In 1949, the Senate of a relatively young Third Republic was rocked by a leadership coup that bore a close resemblance to today’s Senate tug-of-war. Albeit back then, though, our Senate had far more honorable members than it has right now.

The case arose from a dramatic power struggle on February 21, 1949. At the time, Jose Avelino was Senate president. Senator Lorenzo Tañada sought to deliver a privilege speech containing accusations against Avelino. During the session, disorder erupted. Avelino repeatedly refused to recognize Tañada, then banged the gavel and walked out of the Senate hall together with several loyalist senators.

Senate President Pro Tempore Melencio Arranz and the remaining senators continued the session to prevent the functions of the Senate from being paralyzed. Tañada was then recognized and allowed to deliver his speech. Thereafter, Arranz gave way to Sanidad’s resolution, which proposed the election of Cuenco as Senate president. The resolution was unanimously approved and was even recognized by President Elpidio Quirino the following day. Cuenco subsequently took his oath of office. In response, Avelino filed a quo warranto petition before the Supreme Court, seeking to be declared the rightful Senate president.

Avelino then filed a quo warranto case before the Supreme Court, arguing that the session had already been adjourned; that the remaining senators constituted only a “rump session”; and that there was no quorum when Cuenco was elected.

The Supreme Court denied Avelino’s petition by a 6-4 vote. The majority held that the controversy involved an internal Senate matter and that the Constitution gives the Senate the power to elect its own president, making judicial intervention inappropriate under the separation of powers doctrine.

However, the Court also discussed the quorum issue. It reasoned that for quorum purposes, senators beyond the Senate’s coercive authority, such as Senator Tomas Confesor, who was abroad at the time, need not be counted. Thus, 12 senators constituted a valid quorum under the circumstances.

The case became famous for two reasons. First, the political question doctrine. It is one of the classic Philippine cases discussing when courts should refrain from interfering in disputes committed by the Constitution to another branch of government. Second, the quorum doctrine. It is often cited for the proposition that a quorum may be computed based on members actually within the chamber’s jurisdiction and subject to its authority.

The story did not end in 1949. Cuenco remained recognized as Senate president and served from 1949 to 1951. Later cases gradually narrowed the political question doctrine and expanded judicial review over congressional disputes. For example, in Tañada v. Cuenco, the Supreme Court reviewed the composition of the Senate Electoral Tribunal, showing a greater willingness to intervene when constitutional issues were involved.

After the 1987 Constitution, courts were expressly empowered to determine whether any branch committed “grave abuse of discretion,” further reducing the scope of nonreviewable political questions. Modern decisions often note that Avelino was decided under the more restrictive framework of the 1935 Constitution. Nevertheless, what happened in 1949 provided tenable jurisprudence that justified the “Quorum of 12” uprising.

In Avelino v. Cuenco, Avelino’s bloc walked out, the remaining 12 senators continued the session, declared the Senate presidency vacant, and elected Mariano Jesus Cuenco as Senate president. The Supreme Court refused to undo it, treating the Senate leadership fight as mainly an internal Senate matter, and accepted that the remaining senators could validly act under the circumstances.

Today’s reported Senate incident resembles that pattern: After a deadlock, 12 senators convened, elected Sherwin Gatchalian as Senate president pro tempore, and proclaimed him acting Senate president amid the absence of the rival bloc. Reports also say Malacañang recognized the new Senate majority, similar to President Quirino’s recognition of Cuenco in 1949.

The key legal issue is quorum. Under the ordinary rule, the Senate has 24 members, so a majority is usually 13. But Avelino is invoked because it allowed Senate action by 12 in a walkout situation, reasoning that the chamber could not be paralyzed by members deliberately absenting themselves. That is why supporters of today’s move will likely cite Avelino.

But there is also a major distinction: Avelino involved replacing the Senate president directly. Today’s move, as reported, elected Gatchalian Senate president pro tempore, making him acting Senate president, not necessarily elected Senate president in the full ordinary sense. That distinction may matter if challenged.

So the gist is: Avelino v. Cuenco is the historical and legal template for today’s Senate “coup.” It supports the idea that a walkout or boycott cannot automatically stop the Senate from reorganizing itself, but today’s validity may still depend on the Senate rules, quorum interpretation, and whether the act was a temporary acting leadership arrangement or a full leadership replacement.

And with these two parallel cases, let history remind us that legislative paralysis serves no one except those who benefit from inaction. When political rivals choose to break a deadlock, the ultimate winner should not be a faction or a politician, but the Filipino people whose welfare depends on a functioning and effective Senate.