Natural gas pipeline serves northern Alberta's oil sands.
TransCanada Mining News
It's the costliest ad campaign undertaken in recent years.
Possible scenarios include lawsuits, trade retaliation or simply waiting for a new administration, while maintaining diplomacy and keeping up pressure.
'Too much work to be done' before application can be filed.
With review from Department of State not complete, decision will likely come next year.
Report prepared by Deloitte & Touche shows the pipeline could also generate $10 billion in GDP just in the construction phase.
US president gives speech on climate change at Georgetown University.