This was tried before--under George Bush Jr. and the Republicans  once  offered undocumented illegal aliens a "fast track" to citizenship if they paid back taxes/paid a fine ($10K was suggested)/and registered for assessment for consideration (ie. no violent histories)---these immigrants/and their bleeding heart supporters said NO and said they wanted nothing less than total amnesty---they took their protests to the streets--unfortunately when the FBI/Immigration service started taking photos of many who attended these protests and then arrested those who were illegals the protests stopped and nothing changed