Rights groups say police are following Duterte's incitements to kill, citing comments of his such as he would be "happy to slaughter" three million addicts.
"And, according to my soldiers, the arms that you sent are very accurate and they were able to take care of the snipers that abounded and I lost more..."
Philippines President Rodrigo Duterte, who plays host to world leaders from Sunday, has said repeatedly in recent months he has never incited his police or vigilantes to kill illegally.
"I will not, for the life of me, renege on that promise because I won on the basis of those promises", Duterte said.
Local and worldwide human rights groups claim thousands more have died as a result of the drug war's alleged extrajudicial killings, but the government has repeatedly denied this.
"Because at that time we were short of arms for the police and we wanted to buy it (sic) from America but because of the nearly equal power of the US Congress and the President, it is always stymied by the legislators", he said.
Phelim Kine, Human Rights Watch deputy Asia director, told Agence France-Presse, "Foreign leaders should recognize that the fist. symbolizes a purposeful attack by Duterte on rule of law that has inflicted a human rights calamity on thousands of Filipinos".
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"At the age of 16, I already killed someone".
For his part, Putin said terrorism was a common challenge for both Russia and the Philippines, noting that Russia was prepared to further develop defense relations between Russia and the Philippines. I was just 16 years old.
Then-presidential candidate Duterte outlines plans to eradicate drugs in the Philippines by killing so many dealers it will unleash a boom for funeral businesses.
The protesters also denounced the Duterte administration for allocating P15.5 billion for the hosting of the summit.
Duterte's spokesman, Harry Roque, has since told the British news network that the comment was made in jest.
In a letter to Trump, members of the Tom Lantos Human Rights Commission on Capitol Hill urged Trump to address the extrajudicial killings.
They are expected to hold one-on-one talks on Monday and, if Trump does not bring up any human rights concerns, Duterte is widely expected to trumpet the meeting as an endorsement.