A bipartisan Senate group has agreed on a sweeping legislative proposal that would represent the most ambitious overhaul of the U.S. immigration system in three decades. The Washington Post will be examining portions of the bill on Post Politics in a series of blog entries.

One area of the immigration bill that will be proposed this week by a bipartisan group of eight senators that is already drawing fire from civil libertarians is the legislation's dramatic expansion of the E-Verify system, a computer system designed to ensure employers hire only workers legally present in the United States.