Justin Trudeau tackled Philippine President Rodrigo Duterte over allegations of extrajudicial killings in Manila's deadly drug war, he said on Tuesday.

he Canadian prime minister's comments came the day after US President Donald Trump hailed the "great relationship" he enjoys with Duterte in a meeting the Philippines government said did not touch on human rights.

"I also mentioned human rights, the rule of law, and specifically extrajudicial killings as being an issue that Canada is concerned with," Trudeau told reporters in Manila, recounting a conversation with Duterte.

"I impressed upon him the need for respect for the rule of law."

Ahead of a regional summit in the Philippines, rights groups had urged world leaders to challenge Duterte over what they say are gross abuses.

The 72-year-old overwhelmingly won elections last year vowing to eradicate drugs through a campaign that would see up to 100,000 people killed.

Since he took office, police have reported killing 3,967 people in the crackdown.

Source: AFP