“There is a huge supply of excellent workers eager to immigrate legally in Phillipines, South Korea, Veitnam, and China. And these people are willing to assimilate here, not take over our southwest. They are skilled agricultural workers and become good citizens of our country.”
Workers from the Philippines and South Korea are free to leave their countries and the U.S. can choose to admit them. Workers from China and Viet Nam are not free to leave their countries; the U.S. can choose to admit them as well. Communist countries require two visas, one to leave (very, very difficult to obtain) and one to enter the country to which the traveler is going.
If the door were open, we’d have plenty of Cubans looking for work in Florida; the door out of Cuba is not open.
You are right about workers not being free to leave China and Vietnam but the other countries could provide plenty of workers.