The New York Daily News says so:

Fox News boss Roger Ailes doesn’t want to spoil Barack Obama‘s political honeymoon, we hear. A source says Ailes has told prime-time hosts Bill O’Reilly, Sean Hannity and Greta Van Susteren to lay off the President-elect – at least for a while. “We’re not going to have any personal attacks on Obama,” a network insider says. “The public has spoken – we must treat him with respect.”

> Update: In an entry titled “This is a Big Fat Lie,” Van Susteren writes on GretaWire, “No one has ever told me to do or not do something at Fox…as an aside, I have not seen or spoken to Roger in 6 months!”