They can, if they have another open season of getting commitments from companies to use the pipeline to move their oil, another environmental impact study period, another round of public comment, etc.
Years after the application is submitted to approval for a border crossing pipeline.
Yay! We get more oil moved on rail for higher expense!
And considerably more likelihood of environmental damage. [http://www.wsj.com/articles/how-to-transport-oil-more-safely-1442197722] But it's pointless to argue facts and logic with progtards.
Still... Zero gets his high-visibility-anti-carbon moment going into Paris, and appearance is, after all, the only thing that matters.