To some extent, Trump's approach may be a byproduct of his reported belief that there's no such thing as a win-win negotiation. This idea is even more faulty in politics than it might be in business. But to a large extent, Trump continues to govern as if the only people he has any responsibility to are his strongest supporters. This, too, may be a leftover from his business thinking. To make money from Trump University it took only a tiny fraction of all consumers to buy in. It didn't matter if other people thought the whole set-up was a scam, and the person who put his name on it was a buffoon. But politics isn't like that. Strong opponents aren't at all the same as mild or indifferent ones. The more someone is ticked off by the president, the more he or she will mobilize to oppose him. And as more people are more ticked off, the opposition's resources in money and volunteer hours and expertise grow.