From the New York Times:

Michigan asked the United States Supreme Court on Monday to sever a century-old connection between the Great Lakes and the Mississippi River system to prevent Asian carp from invading the lakes and endangering their $7 billion fishery.

The Michigan attorney general, Mike Cox, filed the lawsuit against Illinois, the Army Corps of Engineers and the Metropolitan Water Reclamation District of Greater Chicago. They operate the canals and other waterways that link Lake Michigan and the Mississippi system. Read more.