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.
Last term in Gill v. Whitford the Supreme Court again failed to articulate a standard for unconstitutional partisan gerrymandering. Instead, it held that the challengers failed to demonstrate they had standing to bring their case.
The Supreme Court has agreed to hear two partisan gerrymandering cases this term.