Fox News is facing mounting pressure to fire its most famed anchor Bill O’Reilly over a string of sexual harassment allegations.

An exposé in The New York Times revealed that Fox News and O’Reilly have collectively paid out $13 million in out-of-court settlements to date.

The National Organization for Women called for the host to be fired on Tuesday and said there should be "an immediate independent investigation into the culture of sexual harassment at Fox News."

"The reported use of his powerful position to repeatedly manipulate women reveals a cruel misogyny that runs to the core of his character," its president wrote. "For too long women have endured dangerous sexism at the hands of powerful men and powerful institutions. Fox News is too big and too influential to simply let this go."

"Women have the right to go to work without facing harassment. Fox News apparently doesn’t get that basic concept."

Companies have begun pulling their ads from O’Reilly’s show The O’Reilly Factor - CBS puts the number of brands at 12, the list including lucrative clients Mercedes-Benz, BMW and Hyundai.