"During my campaign, it was my responsibility to make sure things were done correctly," Ard said in a press release, according to The State. "I did not do that."
Ard said he "must take full ownership and resign from the Office of Lieutenant Governor ... I am deeply sorry and take full responsibility."
South Carolina Republican Party Chairman Chad Connelly issued the following statement:
"Lieutenant Governor Ard has taken responsibility for his actions. His resignation will help our state move past this sad and unfortunate incident. Our thoughts and prayers are with Ken and his family during this time," said Chairman Connelly.