The U.S. has expressed concern over the extrajudicial killings and urged Duterte's government to ensure law enforcement efforts comply with human rights obligations. Last month, Obama canceled a planned first meeting with Duterte on the sidelines of an Asian summit in Laos after the Filipino leader blurted "son of a bitch" in warning the U.S. leader not to lecture him on human rights ahead of their meeting. Duterte later expressed regrets over his remarks.