O'Reilly, whose comments about Water's hair were widely condemned, is now in the media spotlight after The New York Times reported that he and Fox paid five women $13 million to settle harassment or other allegations against the star pundit.
Fox News paid O'Reilly $18 million in 2016, and his contract with the network expires this year.
Fox News has not responded to comment requests.
In a statement to The Times on Saturday, 21st Century Fox said: "Notwithstanding the fact that no current or former Fox News employee ever took advantage of the 21st Century Fox hotline to raise a concern about Bill O'Reilly, even anonymously, we have looked into these matters over the last few months and discussed them with Mr. O'Reilly".
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Bill O'Reilly, the host of Fox News' popular talkshow "The O'Reilly Factor", is on tenuous ground as a growing number of companies pull advertisements from his show. On Thursday, more than 40 companies had said they weren't running commercials on O'Reilly's show, according to CNN, which has maintained a count. O'Reilly has become one of the bestselling non-fiction authors in America. Glenn Beck was essentially forced out at Fox when his advertising dried up following a sustained campaign against him that eventually enlisted some 200 companies, said Rashad Robinson, executive director of the liberal advocacy group Color of Change. A report in USA Today said that the show's ratings are up from a week before.
The network's top-rated show averaged 3.7 million viewers on Monday night and 3.8 million on Tuesday. "If other advertisers are leaving and you're staying it makes you look worse.I think you'll see all mainstream advertisers abandon this program".
Pillow maker MyPillow said Tuesday that while it doesn't condone sexual harassment, it has ad deal similar to Angie's List where Fox decides the show in which the ads are placed. Amazingly, O'Reilly's once-certain future at the network is now in doubt.
In an interview with MSNBC on Wednesday night, Rep. Waters criticized the President's public defense of O'Reilly while tearing into the top-rated TV host.