Philippine President Rodrigo Duterte has warned President Barack Obama Barack Hussein ObamaTwitter investigating automated image previews over apparent algorithmic bias Donald Trump delivers promise for less interventions in foreign policy Rush Limbaugh encourages Senate to skip hearings for Trump's SCOTUS nominee MORE not to question him about extrajudicial killings when they meet in Laos for a regional summit this week, The Associated Press reported.

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Duterte said he is a leader of a sovereign country and is answerable only to the Filipino people.

The AP reports he said Obama must be respectful and not throw questions at him, or else, "son of a b---h, I will swear at you in that forum."

The comment came after a reporter asked him how he’ll explain the extrajudicial killings in the Philippines, where more than 2,000 suspected drug sellers and users have been killed since Duterte launched a war on drugs after taking office on June 30.

"Clearly he's a colorful guy," Obama said when asked about his remarks at a press conference in China to end the G-20 summit.

Obama said he had heard about the comment and told his aides to determine whether it would still be productive to hold a face-to-face meeting.

"I always want to make sure if I'm having a meeting, it's productive," he added.

"We will always assert the need to have due process," while fighting the issues of crime and drug trafficking, the president continued.