The big monkey-wrench in the FOXNEWS/Trump Feud is the fact that virtually all of talk radio is pro-Trump.
Rush Limbaugh, while not publicly endorsing Trump, fully supports his candidacy at this time. As he had done to the MSM over the Sandra Fluke affair, Trump refused to back down and instead doubled-down. The media lost and his numbers went up.
Michael Savage, love him or hate him, is crazy in love with Donald Trump. Savage is thoroughly disgusted with both Parties.
Face it, Rush Limbaugh is a powerful man. He could have him on his show and it would dominate the news cycle. Reaching over 20 million listeners, plus, as Rush says, that the MSM use his show as "show prep" for their own information.
Having Rush favor Trump while FOXNEWS boycotts him? Does that mean Sean Hannity couldn't have Trump on his show? Sean wouldn't put up with that. Not going into a campaign season.