S. 478 · 116th Congress Social Security Expansion Act StageIn committee SponsorBernie Sanders Introduced2019-02-13 Latest action2019-02-13 · Introduced in Senate Follow Summary Text Subjects Cosponsors (4) Votes (0) Actions Cosponsors (4) Cory Booker Current member Senate NJ Democrat Kirsten Gillibrand Current member Senate NY Democrat Kamala Harris Former memberVice presidentDemocrat Jeff Merkley Current member Senate OR Democrat