Didn't this happen last time? Less dramatically, but still.
He puts in a bunch of tariffs. China reciprocates. The market is thrown into chaos. He shouts and screams. China ignores him. He backtracks. China ends the tariffs but doesn't do anything to try and appease him. He claims it's a victory. His fluffers say the tariffs were just to bring China to the table, which justifies the hit to the market, despite the fact China didn't come to the table and President Pigshit didn't articulate what China could actually give him to end the tariffs.