"Yes" vote is widely expected in a long-awaited referendum on autonomy, which would grant executive, legislature and fiscal powers to the Mindanao region.
The Senate and House of Representatives easily voted to approve President Rodrigo Duterte's request to extend martial law until the end of 2018 in the restive southern region.
Philippines Defence Secretary Delfin Lorenzana said a five-month long battle against Daesh militants in the south of the country has ended.
Philippine officials said Isnilon Hapilon, Daesh's "emir" in Southeast Asia and Omarkhayam Maute, one of two Middle East-educated "Khalifas" at the helm of the militant alliance, have been killed.
The Bangsamoro Basic Law will give Muslim areas of Mindanao autonomy with executive, legislature and fiscal powers. Mindanao's Marawi City has been under occupation by pro-Daesh militants since May 23.
Monaliza Romato is the niece of the clan's matriarch who was previously supporting operations. Reports have also emerged that Duterte proposed to negotiate with the group to end the siege on the city, then backed out.
The Philippine army says hostages in the southern city are being forced to fight and ferry wounded militants as the battle with a pro-Daesh group holed up in Marawi enters its sixth week.
The governments of the Philippines, Indonesia and Malaysia met as the siege of Marawi City by the pro-Daesh Maute group continues into its fifth week.
As the battle for Marawi City on Mindanao island enters its fifth week, pro-Daesh militants stormed a school in the south of the island and briefly held people there captive. There were no reports of casualties.
At least 11 bags of methamphetamine worth between $2M to $5M recovered during an operation to rid besieged Marawi City of Daesh and linked militants, officials say. Around 600 kg of the drug were seized by authorities in May.
The military disputes the group's claims that fighters held two-thirds of the southern city. The offensive to take back Marawi from pro-Daesh Maute militants has been going on for more than three weeks.
The Philippines military confirms the US is providing technical assistance, but it had no boots on the ground. Thirteen Philippine marines conducting clearing operations have been killed in the battle for Marawi city, a military spokesman said.
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