Duterte's incendiary comments came as he acknowledged major problems in his drug war, which has claimed thousands of lives, admitting he could not win it as quickly as promised and lamenting a corrupt police force.
In one of the deadliest operations of the war, police reported killing 32 people in raids on Monday on suspected drug traffickers in Bulacan province, which neighbours the capital of Manila.
"The ones who died recently in Bulacan, 32, in a massive raid, that was good," Duterte said in a speech to an anti-crime organisation that has backed the drug war. "If we could kill another 32 everyday, then maybe we can reduce what ails this country."