The Keystone XL pipeline is back on — maybe. President Donald Trump signed an executive order Tuesday potentially reviving the Canada-to-Texas pipeline, the subject of a multi-year saga that cast a long shadow over Canada-U.S. relations.

Trump signed a series of executive orders related to infrastructure and construction, the highest profile of which involved the pipeline project that if completed would carry more than one-fifth of the oil Canada exports to the U.S..

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