“There is no shortage of American minds and hands to grow our labor force" - amazing that you can get people to believe that. There is a massive shortage of labor and the labor force participation rate is already dangerously high.
Yes, Trump is also successfully destroying the demand side of the labor economy at the same time. Is that what his supporters imagined that sentence means? It is nevertheless the case that the prime-age labor force participation rate is bouncing off 85% and getting it any higher than that is impossible.