Mirror properly points out that what I propose requires many changes in laws, the constitution and the negotiation of agreements with foreign countries. I agree but we cannot accomplish anything unless we begin. Employer verification of immigration status by the best means available is the next logical step. An avenue for employers to get foreign workers to the extent they can demonstrate the need is another step. A reinterpretation of the 14th amendment or approval of the constitutionality of HR 1940 is another.
We have some leverage with other countries. Remittances can be taxed if those countries refuse to reimburse us for the cost of apprehension, detention and deportation. And foreign aid can be reduced by the amount of that cost. Trade can be also curtailed or taxed where negotiations fail.