Hey I'm Brian Selter. It's time for reliable sources. This is our weekly look at the story behind the story.

But how the media really works, how the news gets made. Now all of us can help make it better.

So let's get started.

This brand new book by Catch and Kill by Ronan Pharaoh

has explosive reporting about Matt Lauer, NBC executives,

and what Pharaoh calls a corporate cover-up.

It is an incredible read. David

Zurwick and Errin Carmone are going to be here with reaction.

Plus Peter Wenner, former Reagan and Bush aide, he says President Trump's

condition is worsening. his decline accelerated.

Here from winter coming up, plus the legendary journalist Sam Donaldson and so much more, but

we start with a real shock to the television system.

Shep Smith resigning from Fox News, throwing up his hands after so many months of tensions

with Fox's opinion shows.

Shep had the power to speak truth,

to provide a reality check to Fox's viewers

who hear pro-Trump talking points all day long.

But he won't be there anymore.

His last day was Friday.

And I think this is bigger than Fox.

It's a sign of what's happening in America and to America.

People sorting themselves into tribes,

...