A Sudanese refugee chosen by NSW Premier Mike Baird to deliver this year's Australia Day address says he has always voted Liberal since arriving in Australia but has withdrawn his support for the party in response to Peter Dutton's comments on job-stealing asylum seekers.

Child soldier turned western Sydney defence lawyer, Deng Thiak Adut, said he would not vote for the Liberal Party because it has tried to "deter the public from empathising with refugees".

"I have voted Liberal ever since I could vote, but this election they won't be getting my support," Mr Adut told Fairfax Media from South Sudan where he is visiting his former homeland.