One of South Australia's independent Tim Storer, one of the federal parliamentarians, announced he would quit politics.
Senator Stoerus faced an uphill battle to be backed by voters who entered the Senate because of the double citizenship crisis that resigned from NXT's Senator Skyakos Scott-Moore.
The Independence Decision cited a family reason for his resignation decision.
"With full knowledge of my life as an independent senator and with much thought and consideration, with my family and the meaning of what this means to my young family over the next six years, I have decided not to nominate him for reelection," he said. .