A leading state One Nation candidate has been slammed for suggesting Australians face demographic replacement at an anti-immigration rally.Stuart Bonds, who heads the party’s NSW upper house ticket, addressed a crowd donning Australian flags at a march in Sydney’s CBD on Sunday.“Make no mistake, we are being demographically replaced inside our own nation,” he told attendees after talking about abortion rates in the developed world.“If we don’t support Australian mothers having Australian children, we are going to pay for other cultures’ children to be brought up in our lands.”He said the “socialist plan” was to “destroy and bring down and...