Enbridge Inc. has asked the Canadian government for legal and diplomatic help to defend its 540,000 b/d Line 5 pipeline against Michigan attempts to shut it down.

Enbridge Vice President Vern Yu disclosed the requests in testimony about the 68-year-old pipeline’s troubles before a House of Commons committee. Line 5 delivers oil and natural gas liquids (NGL) supplies.

“Use every pathway,” Yu said, including intervention, to prevent Michigan Gov. Gretchen Whitmer from revoking a 1953 state easement for the Straits of Mackinac. The state is set to revoke the easement by May 13.

Michigan officials said they would have propane supply security with trains and storage available if deliveries are shuttered on Line 5. The system delivers 75,000 b/d of propane for about 55% of...