Senate President Pro Tempore Panfilo “Ping” Lacson called the recent action of Sen. Imee Marcos “un-Filipino” after she publicly accused her brother, President Ferdinand Marcos Jr., of drug use during the Iglesia ni Cristo protest on Monday.

For Lacson, disagreements among siblings are normal, but “the Filipino way” is to resolve family problems privately — not in front of thousands of people.

“That was very un-Filipino. We have seen siblings quarrel but they confine it inside the home. But to bring your conflict in front of hundreds of thousands of people at the Luneta, to me that's unacceptable as a Filipino. We Filipinos are not like that," Lacson said in a mix of English and Filipino in a radio interview.

Sen. Marcos shocked the crowd at the “Rally for Transparency and a Better Democracy” at Quirino Grandstand when she claimed that the President and members of his family were into drugs.

“Ever since we were children, our whole family has known about his problem. Everyone can read my father’s testimony about his habits and behavior. Back then, I was young and it wasn’t my responsibility. But as he grew older, it became even more concerning. I know that he has used drugs,” Imee Marcos said in front of thousands who attended the second night of the protest.

According to Imee, the problem became serious enough that she and the Presidential Guards would clean up drug paraphernalia after her brother’s parties. She also said she encouraged her brother to marry Liza Araneta in the hope it would lead to change.

“I was wrong — things only got worse. His addiction worsened, even after they got married,” she stated.

Lacson said he was displeased by the senator’s actions and emphasized that there were other venues where she could have raised her concerns.

“I am disappointed with Sen. Marcos' action. She could have done this in another forum, but not to make accusations whether true or not in front of hundreds of thousands of people,” he said.

When asked about the possible motive behind the revelation, Lacson said there could only be one driving force.

"Politics, nothing else. Why discredit your own brother in front of hundreds of thousands of people?" Lacson stated.