Simple, really. It's about "the deal."

Trump's "art" of the "deal" is about using your stronger position (more power, money, etc.) to break your word and renegotiate ANY deal to get a better deal. When it's time to pay the small, family owned business that trusted you and did the work as contracted, you refuse to pay (knowing most small businesses barely survive month-to-month), threaten to file bankruptcy, and bury them in lawyers until they agree to take less than originally agreed.

Next contractor, same show.

In trumpthink, what better time to "renegotiate" the trade "deal" with South Korea than when the N. Korea is testing nukes?

Trust, honor and relationships be damned. It's about "renegotiating" EVERY deal.