The question keeps rolling through my noggin. I can’t stop wondering: How in the world does Brian Williams ever get back to the NBC Nightly News evening anchor desk?

The answer that keeps recurring? He doesn’t. He cannot come back. His credibility is blown to bits.

You see social media still joking about Williams. Things he has said in the past have been questioned by those who wonder if he made it up, as he did about his so-called shoot down in Iraq, when he said enemy rocket fire brought down a helicopter in which he was a passenger in 2003. It didn’t happen. Williams reported it correctly at first, then “misremembered” it in subsequent years as he kept retelling the fib about being aboard the helicopter when it was brought down by a rocket-propelled grenade.

NBC suspended him for six months.

He has said recently that he doesn’t know how he made the story up. He talked about a “brain tumor,” or some such nonsense.

The longer he stays off the air the more difficult it becomes for him to return to it in his previous capacity. The jokesters will continue to concoct gags at his expense. Every utterance he makes will be field-tested immediately to ensure its accuracy.

I think it’s time for NBC to shop around for a permanent replacement.

Indeed, something tells me the network already is looking.