Story highlights CNN's Jake Tapper examines Bernie Sanders' claim made about his own transparency

Sanders has released only his 1040 form, a two-page summary of his federal returns

(CNN) As part of a partnership with FactCheck.org, CNN's Jake Tapper examines a Bernie Sanders claim made about his own transparency and his federal tax returns during a recent "State of the Union" appearance on CNN.

When asked about releasing his "full" federal tax returns, Sen. Bernie Sanders insisted that "we have released them in the past." But Sanders has released only his 1040 form, a two-page summary of his federal returns, not his full returns.

Sanders, who is one of the least wealthy members of the Senate, was asked about releasing his tax returns on CNN's "State of Union." Jake Tapper, the show's anchor, accurately stated that Sanders had released the 1040 two-page summary page of his 2014 tax returns, but not the full returns. Tapper asked Sanders if he would release the full tax returns for the past eight years, as his Democratic rival Hillary Clinton has done on her website.