the answer is obvious. Tent camp on the border. They can go back to mexico if the want. If the cross illegally a 2nd time and most do... its a felony.
That requires a bill passed by Congress ...
No then ACLU will file lawsuit saying tent housing is inhumane and some lefty Judge will agree with them and demand they be given housing with air conditioning, full stocked fridge, a 56 inch TV and food stamps and money for their rent for 6 months.