Transcript for Megyn Kelly returns to Fox, reacts to Matt Lauer scandal
We begin with Megyn Kelly in her first appearance on Fox News since leaving she's peeking out against another former employer, NBC, calling for an independent investigation into how the network handled sexual assault allegations against Matt Lauer and linsey Davis has that story. Reporter: Megyn Kelly had a lot to say and did not mince any words. She's worked at two networks experiencing sexual assault and misconduct allegations, first Fox News then NBC and now she's saying to NBC if you have nothing to hide then don't hide anything and get afternoon independent investigation. NBC says it has nothing to hide, great. Let's not hide anything. Reporter: Overnight Megyn Kelly returning to Fox News appearing on tucker Carlson blasting NBC, her forminger network for their hamming of sexual assault allegations leveled against former "Today" show anchor Matt Lauer. Show us all of the agreements, the enhanced severance agreements so we can see which ones are super high. Reporter: Kelly says the network needs an independent investigation into the claims laid out by Ronan farrow in his new book "Catch and kill" including allegations that top executives of the company sought to downplay farrow's pulitzer prize winning words on Harvey Weinstein. Andy lack recently described Lauer's behavior appalling and reprehensible and claimed farrow uses a variety of tactics to paint a fundamentally untrue picture. But Kelly says more needs to be done. The number one thing I've wanted to know is, what did they know and when did they know it. There needs to be an outside investigation into this company. They investigated themselves. That doesn't work. Fox News had an outside investigator. CBS news, NPR, the NFL, this is how it's done. Reporter: Kelly's comments come nearly one year after her rocky tenure at the network imploded following controversial comments she made about blackface. Prior to her move to NBC she spent 13 years at fox. Welcome to "The Kelly file," everyone. Reporter: Becoming one of their biggest names. Kelly has continued to remain a subject of national intrigue. I'm going to be the story. No. Reporter: Charlize Theron transforming into the journalist in "Bombshell" chronicling fox News' handling of their own sexual harassment allegations which led to the resignation of former CEO Roger Ailes. She went on to say Ronan farrow's new book gave us 400 reasons to doubt the investigation and if NBC executives didn't know about allegations against Lauer, why didn't they know? Earlier this month in an interview with "Us weekly" when asked about him, she said I know too much that others don't know. Very ominous commentary there. All right, linsey. Thank you.
This transcript has been automatically generated and may not be 100% accurate.