James Murdoch also told friends in a personal email that he and his wife, Kathryn, will donate $1 million to the Anti-Defamation League.
Murdoch writes that the events in Charlottesville and Trump's response "concern all of us." He added: "I can't even believe I have to write this: standing up to Nazis is essential; there are no good Nazis. Or Klansmen, or terrorists."
Murdoch is the son of the company's co-executive chairman, Rupert Murdoch, a Trump confidant. The company is parent company of Fox News Channel, which has given friendly coverage to the president.
The email was first reported Thursday by The New York Times.