From the Summary: "When President George W. Bush announced his principles for immigration reform in January 2004, he included an increase in permanent immigration as a key component. President Bush has stated that immigration reform is a top priority of his second term and has prompted a lively debate on the issue. Thus far in the 110th Congress, a variety of bills (H.R. 75, H.R. 938, H.R. 1645, S. 1348, and S. 1639) would revise categories for permanent admissions. The bipartisan compromise proposal for comprehensive immigration reform was introduced in the Senate on May 21, 2007, as S.Amdt. 1150 to S. 1348, the Comprehensive Immigration Reform Act of 2007. A modified version of that compromise (S. 1639) is expected to come to the Senate floor as early as June 26. During the 109th Congress, the Comprehensive Immigration Reform Act (S. 2611) would have substantially increased legal immigration and would have restructured the allocation of these visas. S. 2611 would have doubled the number of family-based and employment-based immigrants admitted over the next decade, as well as expanded the categories of immigrants who may come without numerical limits. The Senate passed S. 2611 on May 25, 2006. The major House-passed immigration bill (H.R. 4437) did not revise family-based and employment-based immigration. Proposals to alter permanent admissions were included in several other immigration proposals (S. 1033/H.R. 2330, S. 1438, H.R. 3700, H.R. 3938, S. 1919)."
CRS Report for Congress, RL32235