If the ruling goes against China and Beijing responds with a show of force, it will be a critical test of how far the U.S. will go to support its allies.
Canadian leader says Ottawa has "compelling reason to believe" second Canadian hostage has been killed.
Duterte had caused an outcry by saying news people were "not exempted from assassination."
Filipino leader calls on citizens to take the law into their own hands as war on crime continues.
"Just because you're a journalist you are not exempted from assassination if you're a son of a bitch," Duterte said.
A Canadian hostage was murdered in the southern Philippines last month by an ISIS affiliate.
A former State Department military liaison cited counterterrorism missions in the Philippines and Thailand.
President-elect vows to reintroduce death penalty and a shoot-to-kill policy in war on crime.
Duterte referred to the pope as the "son of a whore" before being elected as the Philippines' new president.
"Duterte Harry" has vowed to kill thousands of criminals and feed them to the fishes.
The captives are shown demanding that government's meet the ransom demands of the militant group.
The Philippines president said Abu Sayyaf also planned to kidnap one of the boxer's children.
Officials have arrested one man on suspicion of hacking government servers.
Officials say China has deployed up to seven ships to Quirino Atoll, also known as Jackson Atoll.
The two face off on April 9 in Las Vegas.
An army spokesman says soldiers clashed with about 300 members of the group late on Wednesday.
The rebel group ordered a 12-day halt to offensive operations against military targets and businesses.
Lance Corporal Joseph Scott Pemberton is being held at a U.S. facility at the main army base in Manila.
The U.S.'s goal is to remind China and other countries about America's right to freely navigate the region.
A senior U.S. official reportedly said U.S. ships would sail within 12-nautical-mile zones that China claims as territory.
Humans, not Mother Nature, are to blame for forcing people from their homes, a report by the Norwegian Refugee Council charges.
Group's success on battlefield and social media inspires offshoots to aid the caliphate's expansion.