The attorneys general from Ohio, Indiana and Louisiana want to weigh in on a court case brought by Enbridge Energy against the state of Michigan.
The company brought the lawsuit after Governor Gretchen Whitmer revoked the easement for the Line 5 pipeline in November, and gave Enbridge until May to cease operations.
Ohio attorney general Dave Yost says Ohioans rely on the pipeline for crude oil and ceasing operations would hurt Ohio oil refineries financially.
Enbridge says it appreciates the support from the other states.
Attorney General Dana Nessel’s office says it will be filing written responses with the court.