Sexual harassment claims are hurting Fox News as more and more companies pull their adverts, but the US President says he thinks the accused host "did anything wrong".
Bill O'Reilly reportedly has a history of sexually harassing female colleagues and guests on his show, and is said to have settled out of court with five complainants for a total of US$13 million.
More than 40 advertisers have now dropped The O'Reilly Factor, the number one programme on US Cable news for 16 years running.
Mercedes-Benz and Sanofi, two companies to withdraw advertising from the show, both confirmed to CNNMoney that the ads would be re-allocated to other Fox programs. However, the Society for Human Resource Management said it had ended its advertising on the entire network.
Although O'Reilly seems inseparable from the Fox News brand, media observers have been split over whether he might be forced to leave.
In July 2016, the network's former boss Roger Ailes resigned in the wake of his own sexual harassment controversy.
President Trump has defended both men.
"I think he's a person I know well - he is a good person," the former Celebrity Apprentice host said of O'Reilly.
"Personally I think he shouldn't have settled. Because you should have taken it all the way. I don't think Bill did anything wrong."
In 2016, before Ailes left the network, President Trump said the claims against him were "totally unfounded, based on what I read."
Less than a year after Mr Trump's own sexual harassment controversy, in which he boasted in leaked audio about grabbing women's genitals without their consent, the President declared April 2017 National Sexual Assault Awareness and Prevention Month
He pledged his administration "will do everything in its power to protect women, children, and men from sexual violence".
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