Former Westchester District Attorney Jeanine Pirro's name is surfacing in a federal probe of former New York City Police Commissioner Bernard Kerik.

A source close to the case says federal prosecutors are eying tax evasion and conspiracy to commit illegal wiretapping charges against Kerik. The wiretapping charge may stem from 2005 conversations Kerik had with Pirro, who unsuccessfully ran for New York attorney general last year. Authorities have Pirro on tape asking Kerik to bug her husband's boat because she suspected he was having an affair.

Sources also say Kerik, who worked for former New York City Mayor Rudy Giuliani's security firm, ordered two workers to follow Al Pirro and "check out" his boat.

Federal prosecutors have yet to charge Kerik, who recently turned down a plea deal that would have included prison time.

The government is pursuing charges mostly related to Kerik's failed bid to become Homeland Security secretary. Giuliani, who is a 2008 presidential candidate, later admitted fault for recommending Kerik for the post.