The Personal Responsibility and Work Opportunity Reconciliation Act of 1996 (PRWORA) is a United States federal law considered to be a major welfare reform.  It invented TANF.  It stands for Temporary Assistance to Needy Families.  The operative words here a "Temporary" and "Families".  The law says that "non-disabled adults without dependents should be required to work to receive food stamps"  These are primarily single men.  If you are able-bodied, you need to work 20 hours per week. or get training so you can get a job.  

It was signed into law by President William Jefferson Clinton.  

It, like NAFTA, also signed into law by  President Clinton, was proposed by a Republican Congress.