Michigan GOP reps ask Biden to support Line 5 pipeline Washington — Michigan Republicans in Congress are urging President Joe Biden to oppose the closure of Line 5, warning of the potential consequences of shutting down the four-mile-long dual pipeline in the Straits of Mackinac. They recently wrote to Biden after he revoked the permit for the Keystone XL pipeline in his first week in office, citing "deep concerns" about the pressure to also shut down Enbridge Energy's Line 5 over environmental concerns. Michigan Gov. Gretchen Whitmer has said she has revoked Enbridge's easement for Line 5 in preparation for a May shutdown, but the issue will be decided in court.