After the GOP lost court challenges to the new Pennsylvania congressional district map, Republican Rep. Ryan Costello tells NBC News plans to file to run for re-election in the new version of his PA-6 district.

He represents an already-swing district in the Philadelphia suburbs that’s becoming distinctly more Democratic under the new map. He’s facing a top challenger in veteran Chrissy Houlahan.

Still, Costello isn’t yet firm in his plans to campaign for re-election, so stay tuned.