Media Matters chairman David Brock is calling on CBS to reopen its investigation into the flawed 60 Minutes report on Benghazi after a New York magazine report raised questions about the validity of CBS' original findings.

CBS came under significant criticism for its October 27, 2013 60 Minutes report on the attacks, in which correspondent Lara Logan prominently featured testimony from an eyewitness who later turned out to be untrustworthy. The segment also included several misleading right-wing talking points. After initially defending the report, CBS pulled the report, apologized to its viewers, and promised a thorough investigation into what went wrong.

The results of CBS' review came into question on May 4, when a New York magazine article revealed problems with the investigation and raised new questions about the journalistic practices that the network employed.

In a letter to CBS that was posted by Huffington Post's Michael Calderone, Brock called on CBS chairman Jeff Fager to reopen the investigation, highlighting discrepancies between the network's review and the New York magazine article and pointing to open questions that still have gone unanswered.