Republican Lindsey Graham of South Carolina, who is running for president, says he might have a "rotating first lady."
Graham, 59, who is unmarried, made the comment in an interview with Daily Mail Online published on Tuesday.
"I've got a sister, she could play that role if necessary," Graham said. Graham's parents died when he was in college, leaving him as guardian to his then-13-year-old sister, Darline.
He went on to add: "I've got a lot of friends. We'll have a rotating first lady."
Grover Cleveland and James Buchanan were the only presidents to enter the White House as bachelors, according to the book "Affairs of State: The Untold History of Presidential Love, Sex and Scandal." Cleveland married while in office.