America cannot afford to five amnesty to 12-20 million poverty level aliens. If they are given legal citizenship they will be entitled to all the benefits of our social services, since they are low wages earners and at poverty level. They will be entitled to medicaid, (medical dental, glasses, medicine.), school breakfast and lunches, wic and state commodities, low income housing, HUD and section 8, unemployment, social security and SSI, etc.
the addition of millions poor would devastate our system. Being law ow wage earners they would pay very little in taxes. They are already a liability. We would become the largest third world country.
They would demand higher wages and compete with Americans for jobs, because business would have to pay them higher wages. Business would hire less. This would be a catastrophic mistake this country would never be able to recover from.