A lesbian couple has asked the Wisconsin Supreme Court to strike down the state's ban on gay marriage.

Katherine and Linda Halopka-Ivery of Milwaukee County said in their lawsuit, filed Wednesday, that the Supreme Court should directly review the case because it involves an issue of great public interest.

Wisconsin currently recognizes gay and lesbian couples with a domestic partnership registry, which offers a limited number of protections.

The registry is being challenged in a separate case. Opponents argue that it violates the state's 2006 voter-approved constitutional amendment banning marriage and anything substantially similar to it for gay couples.

Wisconsin Attorney General J.B. Van Hollen, who is currently defending the ban in a separate federal lawsuit set to go to trial in August, vowed to continue his defense in Wednesday's lawsuit.

“As attorney general, I have defended, and will continue to defend, the laws and the Constitution of the State of Wisconsin. That's my job,” he said.

The Halopka-Iverys, who married in California, could face criminal charges under the state's law, which prohibits gay couples from obtaining an out-of-state marriage.

(Read the complaint provided by Equality Case Files.)