TransCanada sues U.S. over Keystone XL pipeline rejection

Reuters: TransCanada Corp sued the U.S 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."

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