Christian Democratic Party MP Fred Nile says women should reconsider having abortions "if the price of the decision is breast cancer", repeating discredited views that have angered women and health groups.

At a budget estimates hearing at Parliament on Thursday, Mr Nile called on the NSW government to alert women to the so-called dangers of abortion, later claiming that studies confirming the link to breast cancer are being "censored".

Fred Nile could have the casting vote on a decision whether to release phone intercepts. Credit:Peter Rae

"The body is preparing to have a baby … and suddenly it's terminated, and that causes some reaction in the cells, and the cells in the breast particularly," he later told Fairfax Media.

"I can see it's logical. There could be some disturbance to the women's physiology when she has an abortion, because she is programmed to … have a baby, feed a baby, and it stops."