Frankly I don't know maybe Trump wants to tank the US economy so that central banks the world over will bring back free money inflating his own assets, line his pockets with low interest rates loans which would be a boon to his own real estate empire. The president has expansive power on immigration policy, tariffs, etc due to an impotent congress thanks to decades of gerrymandering.
If the US crashes and burns the rich will make out like bandit in the long run maybe not all of them but the ones Trump would care about the most.