TransCanada has filed a lawsuit against the Obama administration and plans to file a claim under the North American Free Trade Agreement over the U.S. government's rejection of the company's proposed Keystone XL pipeline.

 The trade agreement between Canada, Mexico and the United States allows investors from those countries to seek damages when they feel they have been discriminated against or treated unfairly by one of the other NAFTA member nations. TransCanada contends that the United States "unjustifiably" discriminated against the Keystone project and had previously approved pipelines from other investors in a shorter amount of time and under different criteria than applied to Keystone.

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