Michigan governor threatens Enbridge as Line 5 deadline gets closer Enbridge rejects Michigan’s demand to close oil pipeline Tags: MICHIGAN – Enbridge Line 5 pipeline runs under the Straits of Mackinac and the 68-year-old pipeline is at the center of a legal tug of war between Michigan, Canada and Enbridge. Michigan Gov. Gretchen Whitmer and the state’s Attorney General Dana Nessel ran on the promise to shutdown the aging pipeline which they believe poses a serious threat to the Great Lakes. The company had entered into a deal with former Michigan Gov. Rick Snyder to build a tunnel around the pipeline, but Whitmer wants it shutdown Wednesday.