THE Commission on Elections (Comelec) Law Department has summoned former President Benigno Aquino 3rd and two former Cabinet secretaries to an investigation into an alleged election offense involving the purchase of the anti-dengue vaccine Dengvaxia.

The Comelec issued a subpoena against former Budget Secretary Florencio Abad and former Health Secretary Janet Garin for them to appear in a preliminary hearing on March 15.