Philippine authorities handed a subpoena to Vice President Sara Duterte’s office, inviting her to answer investigators’ questions after she publicly threatened to have the president assassinated if she were killed in an unspecified plot herself.

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.

Vice President Sara Duterte on Wednesday said she and President Ferdinand Marcos Jr. have reached a “point of no return,” banishing any possibility of them patching up. According to Duterte, she believes that the Marcos administration is “going after her.