S. 1578 · 114th Congress Taxpayer Bill of Rights Enhancement Act of 2015 StageIn committee SponsorChuck Grassley Introduced2015-06-16 Latest action2015-06-16 · Introduced in Senate Follow Summary Text Subjects Cosponsors (3) Votes (0) Actions Cosponsors (3) Pat Roberts Former member Senate KS Republican Johnny Isakson Former member Senate GA Republican John Thune Current member Senate SD Republican