A U.S. Supreme Court case that raises a technical, but critical issue about a Clean Water Act rule may disappear from the docket as the justices grapple with the fallout from the Trump administration’s effort to repeal Obama-era regulations.

Three times in the past two weeks, the high court has seen the effects of the Trump administration’s push to undo many of President Barack Obama’s policies. The changes, involving employment, immigration and the environment, have played out during oral arguments and special briefings.