HARRISBURG, Ill. (AP) — A congressional district in southern Illinois is expected to disappear following the 2020 census, raising concerns about the redistricting process that determines the number of seats a state gets in Congress.

Experts say the 15th Congressional District, which stretches across southern and central Illinois, will most likely be eliminated after the 2020 census because its population has been steadily dwindling. The population drop will allow Democrats to redraw congressional districts because they’re the dominating party in Illinois.

The Belleville News-Democrat reports Republican lawmakers are calling on Democratic Gov. J.B. Pritzker to support a joint resolution amendment that would change the Illinois constitution’s provisions on redistricting.