I think the Mueller report got wrecked when Mueller made a statement to the effect that ALL those giving testimony were liars and their lies stood assault. Basically, he said that the problem was that the people he was investigating were all liars and their stories held up because of that and there was nothing he could do about it in spite of having the entire power of gov on his side.

Always thought that was VERY strange but, apparently, no really because everybody read it just seemed to shrug their shoulders with a slight "Whatcha gonna do???" and moved on.