Political campaigns can start filing petitions to run for office in Cook County Monday. But some federal judges have ordered those seeking office in Washington, D.C. to wait a while longer.

Candidates running for Congress around Illinois were supposed to start filing petitions with the board of elections today . Now, they have to wait until December 23rd to file. That’s a new date set by a panel of federal judges in Chicago.

The decision comes after a group sued over the new Congressional boundaries in Illinois. Illinois Democrats controlled the redistricting process and Republicans say the new congressional districts aren’t fair.

Rupert Borgsmiller heads the Illinois State Board of Elections. He said delaying the filing process could complicate how someone’s candidacy is challenged.

“When you compact the time frame, it does put a little more pressure on the process to get it completed,” Borgsmiller said. “But it is something that I think we can work with and we will make sure that it gets taken care of.”

Illinois’ primary is March 20th.