Mark McGwire’s Pound of Flesh In the ten years Brian Williams has anchored the NBC Nightly News, he has never once launched a broadcast by lambasting a public figure. Henry Paulson after the economic collapse? George W. Bush after Katrina? Dick Cheney after everything? All were spared the personal disdain of 'America's most trusted newsman.' Until yesterday. Williams began his broadcast by going after true evil: Mark McGwire.