"What is unbelievable to me is that there's so much mythology that's part of the discourse - a lot of it coming from Rachel Notley, but some things are being parroted in the mainstream media analysis about what the various governments can or cannot do", said Lee, who is also co-director of the Climate Justice Project, a research partnership with the University of British Columbia's School of Community and Regional Planning.
"We are actively pursuing legislative options that will assert and reinforce the government of Canada's jurisdiction in this matter", Trudeau also said.
Trudeau gave few details on the legislation he intends to introduce.
Canadian Prime Minister Justin Trudeau on Sunday moved to end an escalating crisis over a Kinder Morgan Canada Ltd (KML.TO) oil pipeline, saying Ottawa was prepared to offer financial aid to ensure the project went ahead.
He insisted that the construction will go forward. She said her government had begun "significant conversations with Kinder Morgan around the financial arrangements that will make sure that it gets done".
"I'm quite confident that should these discussions end successfully, that the pipeline will be built - and that is good, because the pipeline is in the national interest".
That will be filed in the coming days.
"What the government of British Columbia is doing undermines the national interest, divides the country, thwarts the rule of law and severely undercuts our ability to attract sorely needed investment to Canada", he said.
Trudeau did not comment directly on Horgan's planned legal action, but was firm in his insistence that the government is "going to get the pipeline built".
Mr Trudeau's Liberal government in 2016 approved the expansion project, aimed at helping landlocked Alberta ship its oil sands to the Pacific coast and then to overseas markets.
Marathon's spectators under fire for taking pics of collapsed runner
There are also strict rules around accepting medical help with athletes facing potential disqualification if they are assisted. I think now is the time. "I learned a lot from Callum and it got me going at halfway when they said Callum was in the lead".
"The approval process for this pipeline. featured the most extensive consultation with Indigenous communities across this country that we've ever seen", he said.
Marc Lee, a senior economist with the B.C. office of the Canadian Centre for Policy Alternatives, said the Supreme Court could provide clarity on federal authority to have the pipeline built and provincial authority to protect the environment.
Horgan is not the only vocal opponent of the project, however.
Coldwater First Nation near Merritt, B.C. declined to sign a deal to allow Kinder Morgan to expand the existing pipeline on its territory, Chief Lee Spahan told APTN in an interview.
This week, Assembly of First Nations National Chief Perry Bellegarde also said First Nations are being "left out" of the Kinder Morgan discussion.
"Those efforts have been made in the past to simply dismiss and override the concerns of British Columbians, and certainly the concerns of Indigenous peoples", said Phillip.
"This Prime Minister could not be less serious about this vital issue", said Leader of the United Conservative Party Jason Kenney.
Trudeau, however, refused to be drawn into any specific timelines even as he noted that both the USA and Mexico are facing elections in the coming weeks and months that have created "pressures" for both those countries' negotiators.
"I think we can all agree that having taxpayers' money used to backstop a project like this is not the preferred solution".
"If the federal government tries to ram through this pipeline, it could mean going back to one of the darkest times in modern Canadian history", he wrote in the piece, co-authored with Serge Simon, grand chief of the Mohawk Council of Kanesatake.