WASHINGTON — Michigan's two U.S. senators have introduced a bill that would ban crude oil shipments on the Great Lakes, the mlive.com newspaper group reported. The bill also would stiffen engineering monitoring of the underwater pipeline through the Straits of Mackinac. While the U.S. Coast Guard conducts a spill response exercise in the region this week, the bill's sponsors say they want to prevent future major spills by outlawing the use of tanker ships on the Great Lakes.
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