South Carolina's attorney general asked police to investigate the governor's travel after Sanford revealed to The Associated Press he had spent time with Maria Belen Chapur more often than previously disclosed.
Sanford has given two personal checks totaling $3,300 to the state treasurer as reimbursement for part of a taxpayer-funded trip to South America last year. He says the money covered lodging, meals and airfare to Buenos Aires, where he saw Chapur.
Top South Carolina Republicans have called for Sanford to step down.
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