In 1986 a majority of the Supreme Court agreed that partisan gerrymandering may be unconstitutional in certain circumstances. But in that case and since then the Court has failed to agree on a standard for when partisan gerrymandering crosses the line. In Gill v. Whitford and Benisek v. Lamone the Supreme Court again declined to adopt a standard for what constitutes an unconstitutional partisan gerrymander.
In Gill the Court concluded that the gerrymandering challengers failed to demonstrate they had standing to bring their lawsuit. In Benisek the Court allowed Maryland’s redistricting plan to go into effect because, among other reasons, the challengers were too delayed in bringing their lawsuit.