Besides blanket tariffs that make everything more expensive, letting Americans buy less stuff, there will be job losses from retaliation, and less money to buy other stuff.
There is unlikely to be mass reindustrialization of the US in the face of low demand, and not being exportable products due to retaliatory tariffs. Deporting 10m people will harm housing and banking and tax revenue and other demand for stuff.
Until Trump, Republican higher-ups didn’t really want to eliminate immigration for exactly this reason. They wanted them around as scapegoats and cheap labor. If he wins, I wonder what Trump would actually end up doing.
Legal slavesprison labor.