Mr Trump, who has said Mr Duterte is doing "a great job", himself came under criticism during his 2016 presidential run, when he told a campaign rally in Iowa: "I could stand in the middle of Fifth Avenue and shoot somebody and I wouldn't lose any voters, OK?" "A real person, a rumble, a stabbing", Duterte said, adding that the stabbing was prompted by someone looking at him the wrong way.
"You want to ask a question, I'll give you an answer".
"At the age of 16, I had already killed someone".
Duterte and Trump talked briefly on the sidelines of the Asia-Pacific Economic Cooperation Leaders' Meeting in Da Nang, Vietnam.
Duterte then said he sensed good rapport with "an animated President-elect Trump" who understood the way the country is handling the anti-drug campaign.
"We are aware that the Bells of Balangiga have deep significance for a number of people, both in the United States and in the Philippines", a USA national security spokesman told CBS News. "The Pres uses colourful language when [with] Pinoys (Filipinos) overseas", the spokesman told AFP in a text message.
Human rights groups have condemned Mr. Duterte, saying the crackdown has allowed police officers and vigilantes to ignore due process and to take justice into their own hands.
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"What makes the death of people in the Philippines more important than the rest of the children in the world that were massacred and killed?"
Police have maintained that they only kill criminals in self-defence, but Amnesty International has accused them of shooting defenceless people dead and hiring assassins to murder drug addicts. More than 2,000 others have been killed in connection with drug-related crimes.
"Trump must not keep ignoring the grave human rights situation in the Philippines".
The controversial leader has waged a war on drugs in the Philippine since he took office in June 2016.
"Human rights, son of a b***h", he said at the time.