US should decide how many new legal immigrants we want each year.  Auction off the visas for 1/12 of the yearly allotment  each month to the highest bidders (corp or individual).  All liabilities and costs incurred by visa grantees for first five years shall be born by the winning bidders who sponsored them in.  Legal immigration now brings in the best and/or most worthy, no cost to the taxpayer, and the revenue can be used to pay down the debt.  If Elon wants more engineers, he has to outbid others.