The Cato Institute, a right wing "think tank", has issued a set of what it calls "essays" on "downsizing" Social Security (lots of quotation marks here but they're all merited):
Social Security Retirement: Social Security faces a huge financing gap because of its pay-as-you-go structure and the aging of the U.S. population. It should be transitioned to a system of personal savings accounts, which would increase individual financial security and help to avert future tax increases.
Social Security Disability Insurance: Growing numbers of Americans are receiving disability benefits, and the system is subject to major abuses. Policymakers should tighten eligibility for the program and explore ways to move it to the private sector.
Supplemental Security Income: This program for low-income and disabled individuals suffers from similar abuses and overspending problems as Social Security Disability Insurance. The financing and administration of Supplemental Security Income should be devolved to the states.