I don't think there were proper impact studies to begin with, that's the problem. This is Federal land (well, actually, it's Reservation land that was annexed) so the Feds have full power to stop construction but they won't. They can shut work down without a permit but won't, They can shut work down pending impact studies. They can enforce that. But will they? It depends on if this administration wants to give a shit or wants it to be a giant pimple on Trump's ass, especially now that Vets are acting as human shields.
It sucks that it came to this, having read this: http://www.forbes.com/sites/richarde...-indefensible/