Enbridge Energy Line 3

A Enbridge Energy pipeline drilling pad is shown in this June 29, 2018 file photo along a rail line that traces the Minnesota-Wisconsin border near Cloquet, Minn. Wednesday is the deadline for tribal and environmental groups opposed to Enbridge Energy's Line 3 oil pipeline project to ask the Minnesota Supreme Court to overturn a lower court decision affirming the approvals granted by independent regulators that allowed construction to begin last December. (AP Photo/Jim Mone, file)

MINNEAPOLIS — Tribal and environmental groups opposed to Enbridge Energy's Line 3 oil pipeline project asked the Minnesota Supreme Court on Wednesday to overturn a lower court decision affirming the approvals granted by independent regulators that allowed construction to begin last December.

The legal move came as protests continue along the route in northern Minnesota. More than 500 protesters have been arrested or issued citations since construction on the Minnesota leg of the project began in December, but they have failed so far to persuade President Joe Biden's administration to stop the project. Meanwhile, opponents have been demanding more transparency about a spill last week of drilling mud into a river that the pipeline will cross.

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