Trump suggests he has a plan to allow farmers to keep employing "their" undocumented workers but they will "have to assume responsibility for them." The way he described it workers would be tied to the farms they work at, so if you decide to leave and go work for another farm, or get a better job, you can't stay in the country anymore because the person "responsible" for you is not your employer anymore.
AS a friend said he may as well have just announced on Juneteenth he was bringing slavery back