Grand Chief Stewart Phillip speaks to First Nations leader before signing the Treaty Alliance Against Tar Sands Expansion during an announcement on oil sands pipelines, with special relevance for the Kinder Morgan and Northern Gateway proposals, at the Musqueam Community Centre in Vancouver, British Columbia, Canada, September 22, 2016. REUTERS/Ben Nelms

Grand Chief Stewart Phillip signs the Treaty Alliance Against Tar Sands Expansion with other First Nations leaders during an announcement on oil sands pipelines, with special relevance for the Kinder Morgan and Northern Gateway proposals, at the Musqueam Community Centre in Vancouver, British Columbia, Canada, September 22, 2016. REUTERS/Ben Nelms

First Nations leaders line up to sign the Treaty Alliance Against Tar Sands Expansion during an announcement on oil sands pipelines, with special relevance for the Kinder Morgan and Northern Gateway proposals, at the Musqueam Community Centre in Vancouver, British Columbia, Canada, September 22, 2016. REUTERS/Ben Nelms

Charlene Aleck of the Tsleil-Waututh Nation signs the Treaty Alliance Against Tar Sands Expansion during an announcement on oil sands pipelines, with special relevance for the Kinder Morgan and Northern Gateway proposals, at the Musqueam Community Centre in Vancouver, British Columbia, Canada, September 22, 2016. REUTERS/Ben Nelms

Gabriel George of the Tsleil-Waututh Nation is pictured at the signing of the Treaty Alliance Against Tar Sands Expansion during an announcement on oil sands pipelines, with special relevance for the Kinder Morgan and Northern Gateway proposals, at the Musqueam Community Centre in Vancouver, British Columbia, Canada, September 22, 2016. REUTERS/Ben Nelms

Gabriel George of the Tsleil-Waututh Nation sings a traditional song while First Nations leaders sign the Treaty Alliance Against Tar Sands Expansion during an announcement on oil sands pipelines, with special relevance for the Kinder Morgan and Northern Gateway proposals, at the Musqueam Community Centre in Vancouver, British Columbia, Canada, September 22, 2016. REUTERS/Ben Nelms

Chief Na'moks (John Ridsdale) of the Wet'suwet'en Nation listens to a speech during the signing of the Treaty Alliance Against Tar Sands Expansion during an announcement on oil sands pipelines, with special relevance for the Kinder Morgan and Northern Gateway proposals, at the Musqueam Community Centre in Vancouver, British Columbia, Canada, September 22, 2016. REUTERS/Ben Nelms

Faiez Mustafa Serraj, President of Libya, addresses the 71st session of the United Nations General Assembly at the UN headquarters in New York on September 22, 2016. / AFP PHOTO / DOMINICK REUTERDOMINICK REUTER/AFP/Getty Images