The vice-president of the Philippine resigned from a cabinet post on Monday, citing “major differences in principles and values” with President Rodrigo Duterte and an unspecified plot to remove her from the vice presidency.

Leni Robredo, a human rights lawyer and respected political newcomer, tendered her resignation as housing secretary in a letter to the president but will stay on in her elected post as vice-president.

In the Philippines, presidents and vice-presidents are elected separately and have often come from rival political parties, as is the case with Duterte and Robredo.

Her departure comes amid a political storm for Duterte over his decision to allow the burial of long-dead dictator Ferdinand Marcos in the country’s “heroes’ cemetery” and a bloody crackdown against illegal drugs that has alarmed western governments and human rights watchdogs.