TransCanada Corp.'s challenge to President Obama’s decision to reject a construction permit for the Keystone XL pipeline could keep the pipeline an issue in the upcoming presidential elections.
Construction groups and labor unions had pushed for the $3.3-billion project, saying it would create much-needed jobs and transport crude from Canada's Tar Sands region more safely to the U.S. than by rail. But critics said the pipeline would have spurred more development of Tar Sands crude oil, which, they said, causes more pollution than other types of fuel.