Keystone

Critics argued the program allows pipeline companies to skirt responsibility.

U.S. District Judge Brian Morris ruled that Army Corps officials improperly reauthorized the program.

The company anticipates starting construction at a northern Montana border crossing next month.

The move pushes the controversial $8 billion project closer to construction, but it still faces court challenges.

They say some wetlands were affected, but not any sources of drinking water.

Just as pressure was building on President Barack Obama to make a decision on the Keystone XL pipeline, the project ran into another obstacle.