A series of seemingly authoritative assertions in recent weeks about the shape and scope of special counsel Robert Mueller's probe into Russian election interference has helped define it in the public eye, generating countless headlines and cable chyrons about the ongoing saga that has shadowed President Donald Trump's White House. They were made by Rudy Giuliani, the president's attorney, who has used a media blitz to frequently set - and later move - the goalposts of the investigation, making public declarations about the probe to color its perception among voters and lawmakers, all while confident that Mueller will never speak up to correct him.