Mueller Puts a Stamp on it: Secret Letter to William Barr Overshadows AG's Congressional Testimony Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Attorney General William Barr is sworn in to testify before the Senate Judiciary Committee hearing on Capitol Hill in Washington, Wednesday, May 1, 2019, on the Mueller Report. ( AP Photo/Andrew Harnik ) Produced by Rob Gunther Hosted by Tanzina Vega Produced by PRI and WNYC