The army has used airstrikes and street combat to try and force out the Maute group militants who took hold of the city a week ago.
Attached to one of the bodies was a sign that said "Munafik", meaning "traitor."
Manila has deployed helicopters and commandoes to retake Murawi from jihadists.
"We have a lot of firepower over there," Trump said to Duterte, before revealing that firepower included two nuclear submarines.
Malaysia, the Philippines, Vietnam, Japan, and China all claim parts of the South China Sea.
Manila is looking to ease tensions with Asia's top economic power.
"Here's the shocker: I will kill you. I will really kill you. And that's why the rapporteur of the U.N. is here, investigating extrajudicial killing," Duterte said.
The Philippines is currently involved in a maritime dispute with China over its interests in the South China Sea, although Duterte is attempting to forge closer ties with the country.
To an authoritarian, rules that block what he wants to do are always "bad for the country."
73 percent of respondents said they were concerned that they or someone they know will be a victim of the war on drugs.
The Philippines president has abandoned his plan to plant a flag on the Spratlys.
Trump has expressed his admiration for brutal strongmen like el-Sissi, Putin and Duterte.
"Our forecast for 2017 is that the threat in this region will grow because of the creation of an IS nucleus in the southern Philippines," defense expert Rohan Gunaratna said.
The New York Times article, written by Richard C. Paddock, touched on Duterte's childhood.
"It will crash like a rudderless plane flown by witless pilots" say Duterte supporters
The group, which murdered two Canadians last year, demanded a ransom for his release.
Young children could face adult charges and even the death penalty.
Police corruption has been in focus since police officers were charged with kidnapping and murdering a Korean businessman.