Duterte's attacks against U.N. human rights activists suggest he needs to see a psychiatrist, U.N. High Commissioner for Human Rights Zeid Ra'ad al-Hussein told a news conference on Friday after the Philippine leader criticised U.N. special rapporteurs.

Zeid's comments came after the Philippine justice ministry filed a petition in a Manila court seeking the declaration of more than 600 alleged communist guerrillas, including a U.N. special rapporteur, as "terrorists", a development first reported by Reuters.

The petition included Victoria Tauli-Corpuz, appointed in 2014 as U.N. special rapporteur on the rights of indigenous peoples, who was listed as a senior member of the Maoist rebel group.

Tauli-Corpuz has denounced the government, calling the complaint "baseless, malicious and irresponsible".

Read: Duterte Tells Police Soldiers Not to Cooperate in Drug War Probe

Zeid said Duterte's attacks against U.N. special rapporteurs cannot go unanswered and the U.N. Human Rights Council must take a position. He said the Philippine leader "needs to submit himself to some sort of psychiatric examination".

Philippine Foreign Affairs Secretary Alan Peter Cayetano said: "The Philippines takes grave exception to the irresponsible and disrespectful comments of the United Nations High Commissioner for Human Rights that cast untoward aspersions regarding the President of the Republic of the Philippines."

Duterte has also repeatedly insulted the current U.N. special rapporteur on extrajudicial killings, Agnes Callamard, who Manila has accused of bias and of not being qualified because of her criticism of his bloody anti-narcotics campaign.

The Philippines welcomed a U.N. investigation into Duterte's signature war on drugs but objected to Callamard leading it.

Cayetano said in a strongly worded statement the Philippines was bothered by "the manner in which a ranking U.N. human rights official can overstep his mandate and insult leaders of member-states without first giving them due process".

"This could set a dangerous precedent that the council would have to immediately address as otherwise, member-states could also fall victim to those who seek to politicise and weaponize human rights to undermine legitimate governments," he said.

Cayetano said the U.N. human rights official "may not be aware of it but he is being used in a well-orchestrated effort to destabilize a legitimate government by parties with self-serving agendas".

REUTERS