Cheney, who moved back to the state in 2012 and is running against Sen. Mike EnziMike EnziFive takeaways from Trump's first budget proposal Eliminate Foreign Investment in Real Property Tax Act of 1980 to create jobs Trump releases budget that slashes government programs 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.