Justice Samuel A. Alito Jr., who hears emergency requests from Pennsylvania, turned down the petition from Pennsylvania Republicans to delay redrawing congressional lines, meaning the 2018 elections in the state will probably be held in districts far more favorable to Democrats. The Pennsylvania Supreme Court last month ruled that the state’s Republican legislative leaders had violated the state Constitution by unfairly favoring the GOP. According to Robert Barnes, the Supreme Court traditionally does not interfere in cases involving state constitutions.
Previously, a court had ruled North Carolina's gerrymander of General Assembly seats an illegal redistricting for partisan advantage according to the US Constitution, and the US Supreme Court stopped the implementation of that order.
Lesson learned: We need to sue in state court to end partisan gerrymandering.