Of course, I'm sure it's because of the nanny..

BBC NEWS | World | Americas | New US security chief pulls out:

The pull-out came after Mr Kerik uncovered tax and immigration problems relating to his employment of a nanny.

'I uncovered information that now leads me to question the immigration status of a person who had been in my employ as a housekeeper and nanny,' he said in a statement.

'It has also been brought to my attention that for a period of time, during such employment, required tax payments and related filings had not been made.'"

Still, this is good news.