FILE - In this June 24, 2013 file photo, Sen. John Hoeven, R-N.D., leaves the floor of the Senate at the Capitol in Washington. The explosive derailment of a tanker car near Casselton, N.D., on Dec. 30, 2013, has North Dakota’s senators pushing harder than ever for expanded oil pipelines. Both Hoeven and Democrat Heidi Heitkamp say they’ve stressed to federal officials in recent days that the North Dakota accident and other recent derailments show, at least in part, the need for more pipelines. (AP Photo/J. Scott Applewhite, File)
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