"Wow, Trump is a genius. Sowing the seeds of discord between the two. Got to tip my hat to him."
The man is nothing if not a superb manipulator of others. And yes, I agree, he was brilliant to plant seeds of doubt in Rosie and Barbara's minds about each other. He must be willing to write off his friendship with Walters as the price of victory over O'Donnell, however.
Unless, in reality he is helping Walters dump Rosie.