U.S. Debt Will Grow: Foreigners will not be able to buy much of US issued debt (Treasuries and Bonds) so US investors may be forced to buy it.
Foreign Capital Inflows Will Fall: Foreigners will have less dollars to put back in the US economy.
Cost May be high: Tariffs will increase the costs.
Slowdown and Uncertainty : Economy may slow due to people slowing spending
Politics will be Key : Any uneasy political dialog will hurt the entire situation.