Discussing the allegations against Tauli-Corpuz in a March 9 press conference, Zeid Ra'ad al-Hussein, the UN High Commissioner for Human Rights, provocatively suggested that Duterte should see a psychiatrist.
Victoria Tauli-Corpuz, a Philippine national and the UN's special rapporteur on the rights of indigenous peoples, said in a telephone interview that she is "concerned" about the Philippine government's attempt to list her and about 600 others as "terrorists".
"I think the matter of the statement by the UN High Commissioner on Human Rights is being treated very seriously". "[Duterte] needs to submit himself to some sort of psychiatric examination".
The President made the stern warning, as he also reiterated his order to the Philippine National Police (PNP) to remain silent, if they are asked about the supposed human rights violations linked to his anti-narcotics drive.
"Instead of attacking the messenger, states and other stakeholders should engage and address the human rights concerns raised by mandate-holders", he said in Geneva.
Despite saying that the United Nations commissioner's pronouncement was "uncalled for", Malacañang said this will not affect the openness of the country to let United Nations rapporteur investigate the killings linked to the administration's war on drugs and alleged human rights violations.
Critics said Duterte in his public pronouncements ordered or encouraged policemen to kill those involved in drug trafficking, resulting in thousands of alleged extrajudicial killings.
Duterte conceded that human rights investigators would likely be angered by his advice, but he insisted silence in response to their questions is legal under Philippine constitutional law.
President Rodrigo Duterte said after winning office in mid-2016 that he aimed to forge a peace deal with the NPA, with some of whose leaders he has long-standing personal ties.
There was no basis for the charge of terrorism, said Mr Sison, who was a mentor of Mr Duterte when he was at university, although the two are now bitter rivals. He stopped doing this just a few months later after he said he was being repeatedly attacked by the New People's Army, claiming in its petition to the court that they are "using acts of terror to sow fear and panic to overthrow the government".
Victoria Tauli-Corpuz, a United Nations expert on the rights of indigenous peoples, was included on the list of alleged communist guerrillas. Also listed were four former Catholic priests and former Filipino congressman Satur Ocampo.
Manila hit back at Zeid's comments on Saturday, noting that Tauli-Corpuz was included on the list not because of her position as Special Rapporteur but because of her alleged links with the Ilocos-Cordillera Regional Committee (ICRC) of the CPP-NPA.
Concluding the statement, Cayetano noted that the "world actually needs more Dutertes―leaders with empathy; leaders who listen to their people; and leaders who are ready to sacrifice their lives to protect their people".