I’m not sure Trump is really doing this because of Kelly. Compared to three months ago, outside of several commentators who clearly dislike him, Fox is virtually kissing Trumps rump lately.
He did it because Ailes sent this out:
the network poked fun at Trump in a satirical statement: “We learned from a secret back channel that the Ayatollah and Putin both intend to treat Donald Trump unfairly when they meet with him if he becomes president. A nefarious source tells us that Trump has his own secret plan to replace the Cabinet with his Twitter followers to see if he should even go to those meetings.”
The bottom line is he said to Ailes you think you can treat me that way and make $100 million dollars off me tomorrow night too ? No chance.