They got here, one-by-one, two-by-two by walking across the border. They can go back, exactly the same way. They had an incentive to break the law to get here so they came. All they need is an incentive to return. Start with biometric identification cards. Add verification of same as a condition of employment and for receiving medical care or welfare. Make failure to verify an expensive crime for employers and public servants. Put a tax on remittances to Mexico sent by unverified persons sufficient to pay for the services that illegals have consumed for the past 20 years. Revoke citzenship rights for all children born to illegals. If a guest worker scheme is implemented, then make it a condition that applicants apply in their country of citizenship. Do all that and the illegals will have no incentive to stay in America. They’ll just take a bus back to the border and walk home, one-by-one, two-by-two.