Hollywood director Rob Reiner has denied any wrongdoing after a newspaper report highlighted potential misuse of taxpayers funds.
Reiner recently directed Rumour Has It, starring Jennifer Aniston
Reiner created and heads advocacy group First 5 California Children and Families Commission.
He also campaigns for nursery places for all four-year-olds, and to raise taxes to fund nursery projects.
The report said the Commission spent $23m (£14m) in state funds on adverts that promoted the benefits of nursery.
Reiner, 58, directed A Few Good Men, When Harry Met Sally and Stand By Me.
The Los Angeles Times story said the TV adverts coincided with the campaign for Reiner's "Pre-school for All" initiative, Proposition 82.
The commission also earlier paid for a political consultant who is now the campaign manager of Proposition 82, the story claimed.
But Reiner's lawyers insist the Commission adverts were legal and proper, and Reiner himself dismissed the Times story as "the price of being a public figure."
When asked to comment about the money spent on the Commission's adverts, Reiner said: "There is absolutely no conflict of interest."
Proposition 82, is an initiative that would levy a higher tax on California's highest wage earners to fund pre-school for all 4-year-olds by 2010.
A ballot on Proposition 82 will be held in June.