More than half a million Filipinos rallied in the capital Manila on Sunday to demand accountability for a government corruption scandal that has triggered a series of protests since August.

Sunday’s protest is part of a three-day rally organised by the Philippine sect Iglesia Ni Cristo (Church of Christ). The show of force on Sunday by the influential religious bloc, popularly referred to by its acronym INC, is a complete reversal from its support of President Ferdinand Marcos Jr, whom it endorsed in the 2022 presidential race.

Central to the ongoing protest is the church’s demand for a “proper and transparent” investigation into the alleged misuse of multibillion-dollar funds for flood control projects under Marcos’s watch.

But it also exposes the escalating fight for political power between Marcos and his former ally and running-mate, Vice President Sara Duterte, whom the religious group continues to support. Marcos and Duterte had a dramatic falling out just several months after their landslide victory.

The corruption scandal has only turbocharged the political feud between the country’s two highest elected leaders and turned into calls for Marcos’s removal before his term ends in 2028.

The removal movement is being led by supporters of Duterte as well as some elements of the INC and other groups. The INC insists it is not joining calls for Marcos’s removal, but the presence of its members on the streets of Manila means they are a