ATLANTA — Republican candidate Herman Cain declared “Here we go again” as he faced the latest crisis in his presidential campaign: an accusation of a 13-year extramarital affair with an Atlanta businesswoman.

On Monday, Ginger White said in an interview with Fox 5 Atlanta that her affair with Cain ended not long before the former businessman from Georgia announced his candidacy for the White House.

“It was fun,” said White, 46, as she described how Cain had bought her plane tickets for a rendezvous in Palm Springs, Calif. “It was something that took me away from my sort of humdrum life at the time. And it was exciting.”

Cain went on television to deny White’s claims even before the report aired. It was a faster and more deliberate response than he had managed when it was reported that three women alleged he had sexually harassed or groped them when he was the president of the National Restaurant Association in the mid- to late 1990s. The trade group paid settlements to two women who had worked there.

“Here we go again,” Cain told CNN as he denied White’s accusation. “I didn’t do anything wrong.”