A candidate in the NSW Liberal Party state executive elections has mocked what he calls the "inbred Arab brain" while agreeing that the world would better off if Saddam Hussain and Colonel Muammar Gaddafi were still in power.

Alan Sexton, a western Sydney anaesthetist and Liberal Party member, made the comment on Facebook in response to an article about US billionaire and candidate for the Republican presidential nomination Donald Trump.

In the article, Mr Trump is quoted as saying: "People are getting their heads chopped off. They're being drowned. Right now, it's far worse than ever under Saddam Hussein or Gaddafi".

Dr Sexton replies that Mr Trump "is right", and uses controversial Auburn deputy mayor Salim Mehajer to make his point.