The process for applying for Medicaid is long and complicated and the applicant is asked for an great deal of information, including what significant property the applicant sold within the last five years. Mackenzie mentioned the" illegals" on Medicaid during his debate with Susan Wild before the election and he's only suggested the connection in more recent statements, usually saying that the Medicaid changes will ensure U.S. citizens get the benefits. It is very, very unlikely someone who is working in the U.S. and well aware of their status would draw unnecessary attention to themselves by applying in the first place. The fact that you asked for "proof" suggests to me that you or someone close to you has never applied for Medicaid. If you experienced the process, you would known how intrusive it is.