Cheney, who moved back to the state in 2012 and is running against Sen. Mike EnziMichael (Mike) Bradley EnziThis week: Congress gets ball rolling on tax reform How the effort to replace ObamaCare failed Senate GOP budget paves way for .5T in tax cuts MORE (R-Wyo.), wasn't allowed to claim residency when she received a citation in August, 2012, because she hadn't yet lived in Wyoming for a year, according to the Jackson Hole News & Guide.

The ticket could prove to be fodder for her opponents. Cheney's recent move back to Wyoming has been criticized by Enzi allies, who have repeatedly attacked her as a carpetbagger.

Cheney has pushed back by pointing out she grew up in the state and that her family has Wyoming ties going back to before the Civil War.

"When I went in to purchase a license, the clerk asked if I was a resident," Cheney said in a statement. "I said yes because I was living in Wyoming. It was my mistake not to realize there was a 365-day requirement to hold a resident license. The clerk did not ask how long I had lived in Wyoming.

"When I realized that I had not fulfilled the residency requirement, I met with officials from Game and Fish in Jackson and I paid the requisite fine on August 14," she added.

--This report was updated at 9:24 p.m.