Tacopina said he believes the Feds are also investigating Kerik’s taxes, but declined to give details. (Prosecutors wouldn’t comment on the tax issue.) Kerik’s nomination to succeed Tom Ridge as Homeland Security secretary was withdrawn after Kerik confessed to a “nanny problem”; earlier this year Kerik pleaded guilty to charges of accepting gifts from a company that wanted to do business with New York City’s government. “We are not afraid of any investigation,” Tacopina said.