O'Reilly has denied allegations of harassment - including sexual harassment - despite payments from the network and himself to keep at least five accusers from going public, according to The New York Times.
The company said Wednesday that it had parted ways with longtime host Bill O'Reilly after a "thorough and careful review of allegations against him".
The announcement followed growing reports that the corporation headed by Rupert Murdoch meant to sack the veteran host and just hours after the right-wing television personality was photographed shaking hands with Pope Francis in Rome.
Wednesday on The Lead with Jake Tapper, Ana Navarro weighed in on the news that has rocked the media world - Bill O'Reilly's departure from Fox News.
One harassment case, from a former producer who said O'Reilly called her and described sexual fantasies and appeared to be masturbating, dated back more than a decade and was widely reported then.More news: UK Foreign Secretary Cancels Moscow Visit
Kasowitz also said "irrefutable" evidence would soon reveal "that the smear campaign is being orchestrated by far -left organizations bent on destroying O'Reilly for political and financial reasons".
"Mr. O'Reilly is fully committed to supporting our efforts to improve the environment for all our employees at Fox News".
OANN, for example, is available in about 35 million households in the USA, while Fox News is available in nearly 100 million.
Elsewhere in the media, though, the revelation was a big topic among journalists and media executives, with many wondering if O'Reilly - long seen as invincible for his ability to weather previous controversies - might actually lose his job. Such allegations drove Roger Ailes from the company.
O'Reilly's departure will not have any effect on Twenty-First Century Fox's overall profitability, said Brian Wieser, an analyst at Pivotal Research.More news: Rex Tillerson: U.S. Is Conducting 'Comprehensive Review' Of Iran Nuclear Deal
"You need to write and call Fox News Channel today and tell them, you can lose your advertisers or you can lose your viewers", Beck said on his radio show hours before the firing.
In a statement posted on his Web site, O'Reilly said he was "extremely proud" of his time at Fox News, which he said "significantly contributed to building Fox into the dominant news network in television".
"And I was told basically, "Well, you know, Bill". Ousting O'Reilly, he said, "does not speak to a changed culture".
The National Geographic channel has turned several of O'Reilly's books into TV movies. Such tickets can be obtained via special request to the papal household from embassies, high-ranking churchmen or Vatican officials.
Francis always swings by the VIP seats at the end of his audience for a quick round of handshakes.More news: Two people killed during anti-government protests in Venezuela
Walsh does not have a legal claim against O'Reilly due to the statute of limitations on harassment cases in NY and California, but she did report the matter to the human resources hotline of the company earlier this month.
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