In the arena where the Dallas Mavericks once showcased their brightest star, President Trump paused a speech on oil and geopolitics to mourn a basketball trade — suggesting, half in jest, that he might undo what he called one of the worst deals in sports history. The moment was brief but revealing: a president who sees the world through the lens of negotiation, finding in the Dončić trade a familiar kind of loss — a generational asset surrendered for uncertain return. It is a small episode in a long pattern of a leader who treats the stadium and the summit as equally worthy stages for his inst