Steffen Angenendt of the German Institute for International and Security Affairs examines the debate on temporary labor migration in the EU.

Clive Crook discusses the "baffling politics" of immigration in the United States.

The Urban Institute reports on the characteristics of illegal immigrants in the Los Angeles area, California, and the United States as a whole (PDF).

There is scant evidence that illegal immigrants have caused any significant damage to the wages of American workers.

Standard & Poor's answers some of the crucial questions involved in the illegal immigration debate, and discuss its costs and benefits in the most affected states and municipalities along the U.S.-Mexico border.

Estimates of the number of undocumented immigrants remain fuzzy and full of pitfalls, even as lawmakers toss them around in the latest round of debates over whether to offer guest-worker status to illegal immigrants.

This report analyzes the problems of immigration facing the United States, focusing on five specific metropolitain areas.

This report covers the immigration histories of 94 terrorists who operated in the United States between the early 1990s and 2004, including six of the September 11th hijackers. Other than the hijackers, almost all of these individuals have been indicted or convicted for their crimes. The report builds on prior work done by 9/11 Commission and the Center for Immigration Studies, providing more information than has been previously been made public.

The findings show widespread terrorist violations of immigration laws. The report highlights the danger of our lax immigration system, not just in terms of who is allowed in, but also how terrorists, once in the country, used weaknesses in the system to remain here. The report makes clear that strict enforcement of immigration law – at American consulates overseas, at ports of entry, and within the United States – must be an integral part of our efforts to prevent future attacks on U.S. soil.

While immigration policy reform is long overdue, the solutions now being considered by Congress are unlikely to solve the problem, says a new Council Special Report. By creating a guest worker scheme that replicates the flaws of the current legal immigration system, Congress is failing to understand the economic incentives that drive illegal immigration. “In their efforts to gain control over illegal immigration, Congress and the administration need to be cautious that the economic costs do not outstrip the putative benefits,” warns the report, The Economic Logic of Illegal Immigration.

Two experts debate the extent to which U.S. security is affected by immigration.

Immigration experts Bruce Fein and Marc R. Rosenblum debate the wisdom of offering a path to citizenship for the estimated twelve million illegal immigrants in the United States.

The debate over immigration rages on as Congress tries to reconcile very different approaches to addressing the growing number of illegal immigrants in America. Tamar Jacoby of the Manhattan Institute and Steven Camarota of the Center for Immigration Studies discuss how the United States should handle the issue.

Julia Sweig examines Vice President Biden's upcoming trip to Brazil, Colombia, and Trinidad and Tobago.

Edward Alden, Bryan Roberts, and John Whitley argue that the Obama administration can gain the trust of Congress and a skeptical public only by developing and publicly reporting real measures on the effectiveness of border enforcement.

According to Ted Alden, "U.S. tracking of visa overstays is not perfect, but neither is it the massive hole in immigration enforcement that too many in Congress believe exists."

Edward Alden writes that the GOP should embrace immigration reform and follow the Canadian Conservative Party's example on how to woo the immigrant vote.

Julia Sweig reflects on implications of the Boston Marathon bombings in the midst of debates on gun control and immigration reform.