Listing some of Manila’s actions against UN officials, rights chief Zeid bin Ra’ad Zeid al-Hussein said “it makes one believe that the president of the Philippines needs to submit himself to some sort of psychiatric evaluation.”
Zeid and other UN rights officials have focused significant attention on Duterte’s controversial drug war.
Police have killed more than 4,100 drug suspects, but rights groups allege more than 8,000 others have been murdered in what they describe as crimes against humanity.
The UN special rapporteur on extra-judicial killings, Agnès Callamard, has become a particular Duterte target over her criticism of his campaign to stamp out illegal drugs.
In an exchange with Manila’s envoys in the UN Human Rights Council on Thursday, Zeid referred to November media reports from the Philippines that quoted Duterte threatening to slap Callamard, while using profanity.
“These attacks cannot go unanswered,” Zeid told reporters on Friday.