Chiefs from Treaty 8 First Nations of Alberta are calling for a pause on the pipeline memorandum of understanding until they are consulted and sign off on the potential project. And they’re threatening legal action if that doesn’t happen.

The chiefs spoke in Ottawa Thursday, decrying what they said was a lack of consultation with First Nations before Prime Minister Mark Carney and Alberta Premier Danielle Smith agreed to the MOU in November.

“We have formally notified the prime minister that any further attempt by Canada, Alberta, or industry to move ahead without us will result in immediate action,” Grand Chief Trevor Mercredi said.