(CNN) If Sen. Lindsey Graham were to become the first life-long bachelor president in more than a century, then who would fill the role of first spouse?

"Well, I've got a sister, she could play that role if necessary," said Graham in an interview with DailyMail.com published Tuesday when asked about who his first lady would be. "I've got a lot of friends. We'll have a rotating first lady."

While Graham announced his candidacy in Central, South Carolina on June 1, his sister, Darline Graham Nordone, was there to introduce him.

Graham's sister has previously said she's occupied with her immediate family and position as a public information director for the state's Department of Vocational Rehabilitation, so it's unclear what exact role she would play in a Graham presidency.

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