Crown prosecutor Margaret Cunneen was a "special guest" at a fundraiser for the Rev Fred Nile's political party shortly after he questioned her nemesis, anti-corruption chief Megan Latham, at a parliamentary inquiry.

Now Mr Nile is preparing to vote on the committee conducting the inquiry when it decides whether to release explosive telephone intercepts that Ms Cunneen is trying to prevent from becoming public.

The Christian Democratic Party Annual Dinner was held on August 18 last year, with NSW Police Commissioner Andrew Scipione as "special guest speaker".

Mr Nile posted on Facebook about the success of the $60-a-head event, which he said attracted almost 300 people, and that Ms Cunneen was one of the "special guests".