The highly contentious bill, which has prompted protests in Wagga and saw both sides of the issue rally in Sydney over the weekend, is likely to see another round of attempted amendments.

According to an anti-abortion group, Riverina residents have sent thousands of postcards to Parliament urging MPs to vote down the bill.

Mr Fang told The Daily Advertiser that his aim was to support the removal of abortion from the criminal code and the National Party was taking medical advice on amendments.

"The overriding component of the bill , which is the removal of the Crimes Act, is what I support," he said.

"There will be amendments that will go to the upper house and we will look at every single one of those and vote on them on merit.

"I imagine that the bill will be amended."

Mr Fang said he "respected the passion on both sides" of the abortion debate.

Anti-abortion group Right to Life NSW has run a campaign encouraging supporters to write messages to MLCs on postcards bearing slogans like 'Stand For Life'.

Right to Life chief executive Rachel Carling said supporters in the Riverina had filled in and returned a box of 5000 postcards.

"We have been sending them out to people, churches have been distributing them and people have been printing their own (postcards) out," Dr Carling said.

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Dr Carling said the Riverina would be better served by MLCs "actually listening to the majority of the population" on abortion.

"Most people disagree with extreme late-term abortion legislation," she said.

"There are some people who are using the postcards as an opportunity to ask for amendments.

"I would love to see some amendments if it is not possible to get the bill voted down, as at least we are making a bad bill better."

The Australian Christian Lobby last week targeted six Nationals who voted for the abortion bill in the lower house, including sending more than 15,000 flyers to Cootamundra MP Steph Cooke's electorate.

Mr Fang declined to comment on on whether the campaign influenced his stance and said the ACL was "one of many voices".

"It's a lobby group like many others and I am taking my advice from the College of Obstetricians, the Australian Medical Association and all the stakeholders," he said.