On May 12, 2019, NBI agents raided the briefing of poll watchers for Damayan ng Responsableng Mamamayan and Akbayan Party-List at a gymnasium in Barangay Daanghari (2nd District) due to allegations of vote buying. Emilio Marañon III, lawyer of congressional candidate Marielle del Rosario-Tumangan, denied the allegations and called the NBI operation "illegal".
