Actually Trump's plan call for private companies to build the infer-structure in return for an 80% tax credit of what they spend.  Trump has no idea what an 80% tax credit would do to the overall tax revenue.  But anyone with a simple math knowledge know that a company now paying 25% in taxes would not be paying taxes at all. Plus they extra credit above their current taxes would be twice the taxes they would have paid. It becomes a triple reduction to the tax revenue.  That how we reduce the national debt!