Or congress could just undo all the changes they have made that hand out Social Security money to people other than those who worked and contributed to the fund.
It started out as a contributory retirement fund but over the years congress has raided it and treated it as a wefare slush fund to finance their “feel good” changes.
No, it was always mandatory and from the being the law stated that any surpluses from the social security tax had to be loaned to the federal government. If you don’t believe me you can find the social security act of 1935 posted online at various sites.