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Rickford has been meeting with his U.S. counterpart and senators on cross-border energy policy and the controversial Keystone XL pipeline.
The cross-border pipeline to carry Canadian oilsands bitumen from Alberta to Texas for processing and possible export is at the centre of a heated battle between the U.S. Congress and President Barack Obama.
Both houses of Congress have passed a bill approving the pipeline. But Obama's office has said he will veto the bill, saying the U.S. State Department has a process to follow on whether to allow the pipeline to go ahead.
One factor in that process was resolved last week, when a court case in Nebraska failed to overturn the state's decision to allow the pipeline route through its territory.
An Obama veto could be overcome by a so-called "super majority" of 67 U.S. senators. The bill passed the Senate this week with 63 votes in favour and 32 opposed.