Sanders and four other senators sent a letter to Obama asking him to require a full environmental and cultural review of the pipeline.
After Friday's terrorist attacks, activists and organizers are deciding whether to scale back or cancel some planned events.
Is Keystone permanently dead? Will this decision affect the climate? These answers, and more.
The company asked for a delay in review of the pipeline proposal, hoping to push the decision off to the next president. Obama denied the request.
The pipeline company is asking for a delay in the federal review of its proposal, hoping to get the decision punted to Obama's successor.
Sen. Kelly Ayotte is among a handful of politicians trying to shift the GOP's approach. A recent Conservative Clean Energy Summit had the same goal.
The president kicked off a tour of Alaska with a dramatic speech warning of the possibility of "submerged countries" and "abandoned cities."
Rumor has it that Obama will reject the Keystone pipeline soon. We've rounded up the positions of all the people running to replace him.
The president told an anecdote from his college years to illustrate the importance of new rules to clean up climate pollution from power plants.