Many supporting themes and sub-melodies being played here, but the founding ostinato is that TrumPidiot made the only dollars he made in the 80s-90s by executing pump&dumps, one after the other, until Wall Street figured out that he wasn't just taking them for a ride by accident but entirely by design.
On Election Night 2016, he watched the market plummet as results came in, and he saw the turn-around that occurred by the cash open. And he thought, "Did I do that?!?" So, for ~18 months, Agent Orange could turn the market with a tweet or a headline. But for the last few months, that hasn't worked so well -- Mueller Report, indictments, whatever: no market movement. DPRK missile launches? No effect. Blah blah blah.
Right now, he's raking in as much as he humanly can (Haven't you wondered what has taken Eric and DJ out of the news?), to the point where he might *truly* be a billionaire before his term (singular) is up. The "China Trade" drama is the current valley from which "Wolf! Wolf!" will still produce a reaction by the villagers. It won't last -- eventually, all will realize that The Tonal Dumpf is only to be paid heed so you don't step in it.