BBC Trust chairman, Lord Patten, has told Radio 4's World at One programme that he insisted that Newsnight editor Peter Rippon's blog should be corrected after he was informed of its inaccuracies on Sunday.
He had previously supported Mr Rippon's explanation for dropping the programme's Jimmy Savile investigation.
Should I have disbelieved what a senior editor said? I have at a certain point to believe. I can't disbelieve everything that is said.
Amid the fallout from the Jimmy Savile scandal the BBC is investigating nine allegations of sexual harassment among staff and contributors.
BBC boss George Entwistle has spent almost two hours taking questions from MPs about the corporation's handling of the Savile scandal.
Ex-BBC boss Mark Thompson has told ITV News he will help with any inquiry into the corporation and its handling of the Savile allegations.