Nebraska landowners and environmentalists seeking to stop the Keystone XL pipeline today filed a court challenge to a law enacted by their state Legislature to fast-track approval of a new route for the $5.3 billion Canada-to-U.S. project. The lawsuit filed in Nebraska's Supreme Court argues the pipeline statute violates the state constitution by giving the governor the power to greenlight a final route for Keystone XL and attendant eminent domain authority for TransCanada Corp. without due process or judicial review.