As the 30-day deadline nears, the Heiltsuk (helts-uk) and the Kitasoo-Xaixais (kit-ah-soo shy-shy) added their names to a growing list of groups that want the Federal Court of Appeal to review the cabinet decision.
The First Nations, whose territory on the central coast of B.C. is along the tanker path of the project, say they will fight the pipeline in court "and, if necessary, on the land."
The environmental group B.C. Nature has also filed an application with the court, bringing to at least four the number of legal challenges that have been filed in the past few days.
All claim the federal cabinet's decision last month is invalid because it's based on a flawed report from a joint review panel.
B.C. Nature's lawyer, Chris Tollefson of the Environmental Law Centre at the University of Victoria, says cabinet was also legally required to give its reasons for approving the pipeline, which it did not.