Kentucky Secretary of State Alison Lundergan Grimes said she'd challenge Sen. Rand Paul (R-Ky.) if he attempted to run for both Senate and president in 2016.
"The law is clear," Grimes told WHAS. "You can't be on the ballot twice for two offices."
Kentucky's current law says "no candidate's name shall appear on any voting machine or absentee ballot more than once," except for certain special elections, according to the AP.
But Grimes said she wouldn't hesitate to "look to the court" to keep Paul from running for both.
"I will not be bullied," Grimes said. "I think hopefully the people of Kentucky understand that over the course of this past year, and I will not hesitate to seek help and assistance in the opinion of a court."
In November, Paul and Kentucky Republicans were looking into turning the state's presidential primary into a caucus, which would keep Paul's name from appearing on the ballot twice should he decide to make a bid for the White House.
A poll done by SurveyUSA in August showed many in Kentucky opposed a change to the law that would allow Paul to run for both offices.
Senate Minority Leader Mitch McConnell (R-Ky.) recently said it would be a "tough challenge" for Paul to run for both offices in 2016.
"It is one of the things Senator Paul has to grapple with in trying to figure out what the way forward is," McConnell said at a recent event hosted by Politico.