Updated at 4:39 p.m. ET

The U.S. Supreme Court declined to take up a Republican challenge to the newly drawn Pennsylvania congressional map ahead of the 2018 elections.

The decision means Republicans have few, if any, options remaining to try to stem a map that will almost certainly result in Democrats picking up potentially three or four seats and could make half a dozen or more competitive.

Tuesday is the filing deadline for candidates for Pennsylvania's April 26 primaries.

Last month, the Supreme Court also declined to block the state court decision that said the old GOP-drawn map violated the Pennsylvania Constitution.

Republicans drew a gerrymandered map in 2011 that resulted in a 13-5 congressional district advantage. That was despite Democrats having won the state in five straight presidential elections at the time.

Democrats need to win a net of 24 seats to win a majority in the U.S. House.

The decision comes on the same day a federal court dismissed a lawsuit filed by Republican congressmen challenging the new map. It's a double gut punch to the GOP and all but guarantees that Democrats pick up a few seats, and in an election with control of Congress at stake, every seat counts.

Legally, the challenge could also open the path to a slew of state court challenges.

Challengers to the 2011 GOP-drawn map called into question its legality based on the state constitution, a rarity that could provide a road map for challengers in other states.

The Supreme Court's decision Monday also shows a possible reluctance to weigh in on state law when it comes to redistricting.

This is not the last say the Supreme Court will have, however, on redistricting. It is hearing arguments March 28 on a Republican challenge to Maryland's Democratic-drawn congressional map, and the court has a decision pending on a Democratic challenge to GOP-drawn state legislative districts in Wisconsin.

Both cases deal with political rather than racial gerrymandering. While the court has ruled previously on racial gerrymandering, it has never ruled on political gerrymandering.

The Supreme Court will hear arguments April 24 on racial gerrymandering in Texas as well. And the court also temporarily blocked a lower court's decision in a racial gerrymandering case in North Carolina ordering the state to redraw a map that was favorable to Republicans.

Copyright 2018 NPR. To see more, visit http://www.npr.org/.

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