An Illinois woman who runs a child care service out of her home is suing the state, saying its restrictions on day care facilities make it illegal for her to keep a gun in her house for self-defense.

Jennifer Miller’s lawsuit was filed in U.S. District Court for central Illinois after the state emerged as a battleground in the post-Parkland gun debate, with citizens and various localities trying to stake claims on either side of the issue.

Mrs. Miller and her husband, Darin, both hold concealed-weapons permits. But Illinois’ rules prohibit handguns from being kept in day care homes, with exceptions only for law enforcement or others who have to carry guns for their jobs.

Any firearms in other day care facilities have to be unloaded, kept under lock and stored separately from ammunition.

The Millers say the rules mean they have to make a choice: give up their guns or have Mrs. Miller give up her day care.

The state last month gave them a warning, the lawsuit says.

Mrs. Miller has been a day care home licensee since last year and a day care home provider since 2016. Her husband is a special equipment operator for a paper producer in central Illinois — a job that would not require him to keep a gun in the house.

Gun rights groups have taken up their cause.

“We’re in court to make sure that the state cannot discriminate against day care operators who merely wish to exercise the rights we’ve restored in Illinois,” said Second Amendment Foundation founder Alan Gottlieb, whose group brought the lawsuit with the Illinois State Rifle Association and Illinois Carry.

The lawsuit names Lisa Madigan, the state’s attorney general, and Beverly Walker, director of the state’s Department of Children and Family Services, as defendants.Ms. Madigan’s

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