SCOTUSBlog:

At the end of March, the Supreme Court heard oral argument in two cases challenging federal congressional districts in North Carolina and Maryland as the product of unconstitutional partisan gerrymandering. A key question in both cases was whether courts should review partisan-gerrymandering claims at all, or instead leave the issue to politicians and the political process. Citing the uncertainty surrounding that issue, Republican legislators from Ohio and Michigan today asked the Supreme Court to put lower-court rulings that found partisan gerrymandering in those states on hold while they appeal.