Congress will not, however, pass a "comprehensive" solution until the border is sealed and the existing Federal laws are enforced.
About 400,000 illegals are being deported each year, and that is without any help from sanctuary cities, so if the borders could be sealed and more AZ 1070-like state laws being enacted, then in only 10 years it is possible we could empty out most all of the illegals who have crossed into the USA. Illegal immigrant supporters know very well that could happen, hence they are pushing very hard for some sort of amnesty program.