Philippine President Ferdinand Marcos vowed on Monday to fight back against what he called reckless and troubling threats against him, speaking out after his estranged vice president said he would be assassinated if she herself were killed.

The intensifying feud between the Marcos and Duterte camps begins to reshape Philippine politics ahead of the next presidential election.

Under the Philippine penal code, such public remarks may constitute a crime and can be punishable by a jail term and fine.