The story

South Carolina Gov. Mark Sanford, just back from a secret trip to Argentina unknown to his staff or his wife, admitted Wednesday he has carried on an extramarital affair with a woman in Buenos Aires, Argentina.

"I've been unfaithful to my wife," Sanford told a news conference in Columbia, South Carolina. "I developed a relationship with what started as a dear, dear friend from Argentina."

His voice choking at times, Sanford apologized to his wife and four sons, his staff and supporters, and said he would resign immediately as head of the Republican Governors Association. Read full article »

CNN's Peter Hamby and Kristi Keck contributed to this story.

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