The plan was praised by environmental groups, Native American tribes and others opposing Enbridge Line 5. But an Enbridge spokesperson called the plan “wholly inadequate” and at least one propane supplier raised doubts about whether it will adequately replace the propane currently supplied by the pipeline. Whitmer has given Canadian oil giant Enbridge Energy until May 13 to stop transporting oil through the pipeline in the Straits of Mackinac, citing concerns that the aging underwater pipeline poses an “unacceptable risk of a catastrophic oil spill in the Great Lakes.” Much of the plan to replace Line 5 relies on grant programs Whitmer has written into her 2022 budget proposal, meaning it may require legislative approval. Both the House and Senate are controlled by Republicans.