TransCanada Corp sued the US government on Wednesday to reverse President Barack Obama’s rejection of the Keystone XL pipeline, and also plans to seek $15-billion in damages from a trade tribunal. TranCanada’s lawsuit in a federal court in Houston, Texas, called rejection of its permit to build the pipeline unconstitutional. In a separate action under the North American Free Trade Agreement (NAFTA), the company said the pipeline permit denial was “arbitrary and unjustified.”
