The alleged cases of extrajudicial killings (EJKs) in the country brought about by the drug war was not raised during President Duterte's informal interaction with United States President (POTUS) Donald Trump during the sidelines of the Asia-Pacific Economic Cooperation (APEC) Summit in Da Nang, Vietnam last week.
"I believe in our intel agencies", he said, alongside Vietnam President Tran Dai Quang.
"I'm sure he will not take it up", Duterte said. "I know you've had a dispute for quite a while with China, if I can help in any way, I'm a very good mediator and a very good arbitrator".
"You f**k with my countrymen, I won't let you off the hook".
Trump, during a press conference earlier Sunday before departing Vietnam, clarified his comments on whether he believes Russian Federation interfered in the 2016 USA presidential election.
China is claimant to swathes of ocean, extending far outside its internationally agreed 200-mile economic exclusion zone (EEZ).
Trump was expected to arrive in the Philippines at around 5 p.m. (0900 GMT) for meetings with leaders of the Association of Southeast Asian Nations (ASEAN) and other East Asian nations, fresh off an Asia-Pacific summit and bilateral visit in Vietnam.
Since Philippine President Rodrigo Duterte has grown closer to China, Vietnam has emerged as China's main challenger in the region.
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According to Duterte, Trump also commended him on how he handled the drug situation in the country and also the recently concluded Marawi siege.
Near the end of Obama's tenure, Duterte said Obama was a "son of a bitch" who could "go to hell". "Unbridled, undisturbed, unmolested while we use that small way from the Indian Ocean. facing Palawan", Duterte said, referencing the southern Philippines province which juts out into the South China Sea.
"We have to be friends, the other hotheads would like us to confront China and the rest of the world on so many issues", Duterte said at a pre-summit business conference in Manila.
In August, the foreign ministers of the Southeast Asian countries and China adopted a negotiating framework for a code of conduct in the South China Sea, although critics see it as a tactic to buy China time to consolidate its power.
"We want to get that straightened out very quickly", Trump said at a meeting with Prime Minister Nguyen Xuan Phuc. Brunei, Malaysia, the Philippines, Taiwan and Vietnam also have conflicting claims there.
It will be the last leg of a marathon Asia tour that, despite Trump's "America First" policy, may reassure some that his administration remains committed to a region that Beijing sees as its strategic domain.
He said that Trump and Xi had discussed ways to "prevent mishaps, misunderstandings and miscalculations" in the vital seaway. The protesters called for a stop to USA economic and political intervention, and for U.S. troops to leave the country.