here's an interview he did on the topic with regards to how NYC conducted itself:
http://www.weeklystandard.com/weblogs/TWSFP/2006/08/rudy_on_immigration.html
Which states and local governments are using their police to actively round up illegals - at schools, emergency rooms - to set them up for INS deportation? are they doing it anywhere in the country (except for Arpaio in Arizona)? show me a conservative state that does it.
Nobody has ever expected a city to have their police officers function as immigration authorities -- rounding up illegal aliens in hospitals, schools, etc. What Giuliani did went far beyond simply keeping NYPD officers from working as immigration agents . . . he also prohibited all city employees from even reporting illegal aliens to Federal immigration authorities whenever these people interacted with public officials in any way -- as students in schools, patients in hospitals, CRIMINALS ARRESTED BY THE POLICE, etc.