Republicans say they’ll go to federal court this week to try to block new court-ordered boundaries of Pennsylvania’s congressional districts from remaining in effect for 2018’s elections.

Top Senate Republican lawyer Drew Crompton said Monday a separation of powers case will form the essence of the GOP’s argument. Crompton won’t say whether Republicans will go to a district court or the U.S. Supreme Court or what type of legal remedy they’ll seek.

But the case will involve making the argument the U.S. Constitution gives state legislatures and governors, not courts, the power to draw congressional boundaries.

Earlier this month, the U.S. Supreme Court wouldn’t stop the state court’s order to redraw congressional districts. Democratic Gov. Tom Wolf calls the new map an effort to remedy the state’s unfair and unequal congressional elections.

Democratic Pennsylvania Gov. Tom Wolf is applauding the new boundaries of congressional districts being imposed by the state Supreme Court.

Wolf said in a statement Monday that Pennsylvanians “are sick and tired of gerrymandering.” He calls the court’s map an effort to remedy the state’s unfair and unequal congressional elections.

Wolf had backed the Democratic-majority state high court’s ruling last month to throw out Pennsylvania’s district boundaries. Republicans have won 13 of Pennsylvania’s 18 seats in three elections under the invalidated map, although statewide elections are often closely contested.