Philippine President Rodrigo Duterte, who is facing international criticism for his bloody war on drugs, said his country was willing to host a “world summit” to tackle how nations can protect human rights.

The firebrand leader, who spoke in a news conference late on Thursday while in Vietnam for the Asia-Pacific Economic Cooperation (APEC) meeting, said the summit should focus on human rights violations not just in the Philippines but globally.

Some western countries and human rights groups have strongly criticised Duterte’s anti-narcotics campaign that has killed more than 3,900 suspected drug users and peddlers, in what the police called self-defence after armed suspects resisted arrest.

Critics dispute that and say executions are taking place with zero accountability, allegations the police reject.

“Let’s have a summit of how we can protect human rights for all human race,” Duterte said shortly after meeting with the Filipino community in Vietnam, where he also renewed his attacks against United Nations human rights expert Agnes Callamard.

“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,” he asked.

He said all victims of human rights violations are welcome to attend the summit and air their grievances.

Duterte reiterated his threat to slap Callamard if she investigates him for the rising death toll in his war on drugs and would ask her why she has made no comments on the victims of bombings and violence in the Middle East.

“What have you been doing all the time? Why are you so fascinated with drugs?” Duterte said.

The most controversial quotes from Rodrigo Duterte Show all 9 1 /9 The most controversial quotes from Rodrigo Duterte The most controversial quotes from Rodrigo Duterte On killing drug addicts “These sons of whores are destroying our children. I warn you, don’t go into that, even if you’re a policeman, because I will really kill you. If you know of any addicts, go ahead and kill them yourself as getting their parents to do it would be too painful” The most controversial quotes from Rodrigo Duterte Message to China “I will go there on my own with a Jet Ski, bringing along with me a [Phillipino] flag and a pole, and once I disembark, I will plant the flag on the runway and tell the Chinese authorities, ‘Kill me’ ” AP The most controversial quotes from Rodrigo Duterte Christmas message to law-breakers “If you do not want to stop, and just continue committing crimes, then this would be your last Merry Christmas” AP The most controversial quotes from Rodrigo Duterte On sex life “I was separated from my wife. I’m not impotent. What am I supposed to do? Let this hang forever? When I take Viagra, it stands up” AFP/Getty Images The most controversial quotes from Rodrigo Duterte On the drugs trade “None of my children are into illegal drugs. But my order is, even if it is a member of my family, ‘kill him'" AP The most controversial quotes from Rodrigo Duterte Insulting the Pope “We were affected by the traffic. It took us five hours. I asked why, they said it was closed. I asked who is coming. They answered, the pope. I wanted to call him: ‘Pope, son of a wh**e, go home. Do not visit us again’” AFP/Getty Images The most controversial quotes from Rodrigo Duterte Joke about rape “I saw her face and I thought, 'What a pity... they raped her, they all lined up. I was mad she was raped but she was so beautiful. I thought, the mayor should have been first” AFP/Getty The most controversial quotes from Rodrigo Duterte Insulting Barack Obama "Mr Obama should be respectful and refrain from throwing questions at me about the killings, or son of a bitch, I will swear at you in that forum" REUTERS The most controversial quotes from Rodrigo Duterte On Abu Sayyaf Islamic militants "If I have to face them, you know I can eat humans. I will really open up your body. Just give me vinegar and salt, and I will eat you. If you annoy me to the fullest... I will eat you alive. Raw" EPA

Duterte also threatened to ban two American lawmakers from coming to Manila after they criticised US President Donald Trump for inviting him to visit the United States.

“If you do not like me, I do not like you. We’re even,” he said without naming the lawmakers. Democratic Representative James McGovern and Republican Representative Randy Hultgren had called on Trump to highlight the human rights situation in the Philippines in his upcoming visit to Manila.

“I will tell them, you are too presumptuous. What made you think that I am even planning or thinking about visiting your country?”