The Philippines' brash-talking president has threatened to withdraw his country from the United Nations in his latest outburst against critics of his anti-drugs campaign that has left hundreds of suspects dead.

President Rodrigo Duterte ridiculed the U.N. as inutile, and lashed at U.S. police killings of black men.

He pointed early Sunday to the haunting image of a bloodied child pulled from the rubble of a missile-struck building in the Syrian city of Aleppo to hit U.N. and U.S. inability to stop such deadly conflicts while he said he comes under fire for the deaths of criminals.

Duterte also pressed allegations against a Philippine senator and critic, accusing her of having an affair with her driver whom he linked to illegal drugs.