KANSAS CITY, Mo. (AP) — Kansas City residents who don’t want to expand streetcar services are suing over a mail-in election on the issue that they say was unconstitutional.

The Kansas City Star reported Tuesday that four elderly residents filed a lawsuit in Cole County Circuit Court claiming it was challenging for them to vote this summer on a transportation development district expansion.

The vote could lead to an expansion of the downtown streetcar route from Union Station to the University of Missouri in Kansas City.

Residents had to get ballot applications online or at the Jackson County Circuit Court, then mail completed ballots. But the elderly plaintiffs say they don’t have computers or transportation. They want the vote nullified and asked to block future votes.

An attorney for the streetcar petitioners didn’t comment Tuesday.