Muckraking website Mediapart reported Tuesday that Cahuzac had a secret Swiss bank account until 2010, when the funds were transferred to Singapore. It was not clear if the site contends the account is still open. Foreign accounts must be declared to French tax authorities.
Cahuzac is going after Mediapart for defamation and says he has never had a foreign account. He told French radio RTL on Wednesday that the site's claims were "delirious."
Cahuzac has led France's crackdown on tax evasion — part of a larger effort to cut the country's deficit.