Trump has had a hostile relationship with the press for decades. We know that Trump gets revenge on his perceived enemies and holds grudges. By being elected president, he would then be put in a unique position of power and authority that would enable him to get revenge on "the media," and turn the masses against mainstream media. If he could do that, he wins. He wanted to turn the tables on the media. Notice how Team Trump were even discussing ways to change the libel laws to make it easier to go after the media and even individual reporters. Why the fuck would that even be a CONSIDERATION for a guy who was just elected? He and his wife even had a practice run with the publication that talked about her past, and won. Kind of interesting... You can't look at typical motivations with a guy like Trump. If you think in terms of pettiness, you'll see very easily what makes a guy like him tick.