The Canadian government said in May that it will purchase the 1,150-kilometre pipeline from Kinder Morgan Inc. for $4.5 billion but has run into voracious opposition from indigenous and environmental groups since it announced its plans to complete the project's construction.
On Thursday, Morneau said his government inherited a flawed environmental review process from the Harper government and "made efforts to improve it". Additionally, the federal government was seen to have not adequately consulted First Nations, as required by law. It added that the court decision was not a condition of the sale between Kinder Morgan and the federal government. First Nations also have adamantly opposed construction of the project through their territories. "This pipeline is not in the best interests of Canada".
Federal Finance Minister Bill Morneau said his government plans to go ahead with the buyout but has yet to decide exactly how it will respond to the ruling.
Weaver added that with BC coming off the two worst wildfire seasons in the province's recent history, "it's clear that we can not continue down the misguided path of expanding fossil fuel infrastructure".
Washington state Gov. Jay Inslee, an opponent of the project, said he was pleased that the court found there are serious impacts that have not yet been full considered.
The court combined into one case almost two dozen lawsuits calling for the National Energy Board's review of Kinder Morgan Canada Ltd.'s project to be overturned.
"Taken together, today's decisions from the Federal Court of Appeal and Kinder Morgan shareholders are important next steps in getting this project built in the right way for the benefit of all Canadians", he said in Toronto.
"I think what needs to happen sooner rather than later is the federal government needs to get back to serious negotiations with the First Nations as ordered by the federal court".
Trudeau himself laid out for students Wednesday how the pipeline is a crucial piece of his government's climate change and economic growth puzzle.
Speaking at a short press conference in Victoria, Horgan said the case has always been about First Nations rights and the assertion by the Tsleil-Waututh "that the [National Energy Board] process was flawed and did not take into consideration their rights and title".
A Canadian court has overturned Ottawa's approval of a hotly-contested pipeline project - throwing plans to almost triple the flow of Alberta's landlocked bitumen to the west coast into limbo - in a ruling hailed by environmentalists and Indigenous groups.
"This is a proud moment for us as Indigenous people", he said. "It is time for Prime Minister Trudeau to do the right thing", the band said in a statement.
Fuel spills and underwater noise from tankers are just some of the threats that have endangered the southern resident killer whale population.
Kinder Morgan had already won several court victories, including one last week when the Supreme Court of Canada dismissed an application from the City of Burnaby to overturn a lower court decision.
"The unjustified exclusion of marine shipping from the scope of the project led to successive, unacceptable deficiencies in the board's report and recommendations", Dawson wrote, noting that the Governor in Council "could not rely on the board's report and recommendations when assessing the project's environmental effects and the overall public interest".
The Trans Mountain expansion would almost triple capacity on an existing line from Edmonton, Alberta to a port in the Vancouver area for export. "This environmentally destructive project should never have been approved and the Trudeau Government must stop construction immediately", said Grand Chief Stewart Phillip, President of the Union of British Columbia Indian Chiefs (UBCIC).
It would also significantly increase the number of tankers in Burrard Inlet in Vancouver, where Mayor Gregor Robertson said the decision validates concerns from the city.
The court cited two main failures.