 Complete the following phrase:  In a November 10, 2011 phone call, then-President Barack Obama told then Prime Minister Stephen Harper that the Keystone XL approval process was on hold. In response, Frank McKenna, who was then Canadian Ambassador to the U.S., wrote a Ficial Post opinion piece suggesting a west-east pipeline. In June 2013, Irving Oils Arthur Irving and Frank McKenna discuss the TransCanada negotiations which have frustrated Irving and Irving and TransCanada finally reach a deal. The July 6, 2013 the fire and explosion with a blast radius in the 