A court hearing Thursday in Wisconsin could determine whether the pipeline, owned and operated by Enbridge Inc., is allowed to continue operating.
The Bad River Band of Lake Superior Chippewa says spring flooding has heightened the risk of a rupture and it wants a federal judge to shut the line down.
A strongly worded statement from the embassy says doing so would endanger more than 33,000 U.S. jobs and US$20 billion in economic activity.
Canada argues that Line 5 is a vital energy conduit across the U.S. Midwest and an economic lifeline for Alberta, Saskatchewan, Ontario and Quebec.
The Indigenous band fears a rupture would foul not only a key watershed on its territory, but also the waters of Lake Superior.
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