Prosecutorial Discretion in Immigration Enforcement: Legal Issues

Kate M. Manuel
Legislative Attorney

Todd Garvey
Legislative Attorney

The term prosecutorial discretion is commonly used to describe the wide latitude that prosecutors have in determining when, whom, how, and even whether to prosecute apparent violations of the law. The Immigration and Naturalization Service (INS) and, later, the Department of Homeland Security (DHS) and its components have historically described themselves as exercising prosecutorial discretion in immigration enforcement. Some commentators have recently challenged this characterization on the grounds that DHS enforces primarily civil violations, and some of its components cannot be said to engage in “law enforcement,” as that term is conventionally understood. However, even agencies that do not prosecute or engage in law enforcement have been recognized as having discretion (sometimes referred to as enforcement discretion) in determining whether to enforce particular violations.

Federal regulation of immigration is commonly said to arise from various powers enumerated in the Constitution (e.g., naturalization, commerce), as well as the federal government’s inherent power to control and conduct foreign relations. Some, although not all, of these powers belong exclusively to Congress, and courts have sometimes described Congress as having “plenary power” over immigration. However, few courts or commentators have addressed the separation of powers between Congress and the President in the field of immigration, and the executive has sometimes been said to share plenary power over immigration with Congress as one of the “political branches.” Moreover, the authority to exercise prosecutorial or enforcement discretion has traditionally been understood to arise from the Constitution, not from any congressional delegation of power.

Certain decisions have been widely recognized as within the prosecutorial discretion of immigration officers. These include deciding whether to initiate removal proceedings and what charges to lodge against the respondent; canceling a Notice to Appear or other charging document before jurisdiction vests with an immigration judge; granting deferred action or extended voluntary departure to an alien otherwise subject to removal (deportation); appealing particular decisions or orders; and imposing fines for particular offenses, among other things. Enforcement priorities and resources, as well as humanitarian concerns, have typically played a role in determining whether to exercise discretion in individual cases. For example, the George W. Bush Administration temporarily suspended employer sanctions in areas affected by Hurricane Katrina, and the Obama Administration recently began granting deferred action to certain unauthorized aliens brought to the United States as children.

While the executive branch’s prosecutorial or enforcement discretion is broad, it is not unfettered, and particular exercises of discretion could potentially be checked by the Constitution, statute, or agency directives. Selective prosecution, or prosecution based on race, religion, or the exercise of constitutional rights, is prohibited, although aliens generally cannot assert selective prosecution as a defense to removal. A policy of non-enforcement that amounts to an abdication of an agency’s statutory responsibilities could potentially be said to violate the Take Care Clause. However, standing to challenge alleged violations of the Take Care Clause may be limited, and no court appears to have invalidated a policy of non-enforcement founded upon prosecutorial discretion on the grounds that the policy violated the Take Care Clause. Non-enforcement of particular laws could also potentially be challenged under the Administrative Procedure Act if a statute provides specific guidelines for the agency to follow in exercising its enforcement powers. In addition, an agency could potentially be found to have constrained its own discretion, as some courts found that the INS had done in the 1970s with its operating instruction on deferred action.


Date of Report: January 17, 2013
Number of Pages: 30
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Immigration and Border Security: A Compendium

There is a broad-based consensus that the U.S. immigration system is broken. This consensus erodes, however, as soon as the options to reform the U.S. immigration system are debated. Substantial efforts to comprehensively reform immigration law failed in the 109th and 110th Congresses. Whether and how Congress will address immigration reform in the midst of historically high levels of unemployment and budgetary constrictions is difficult to project.

The number of foreign-born people residing in the United States is at the highest level in U.S. history and has reached a proportion of the U.S. population—12.5%—not seen since the early 20th century. Of the 38 million foreign-born residents in the United States, approximately 16.4 million are naturalized citizens. The remaining 21.6 million foreign born residents are noncitizens. According to the latest estimates by the Department of Homeland Security (DHS), about 10.8 million of the 21.6 million noncitizens were unauthorized aliens living in the United States in January 2010, down from a peak of 11.8 million in January 2007. Some observers and policy experts maintain that the presence of millions of unauthorized residents is evidence of inadequacies in the legal immigration system as well as failures of immigration control policies and practices.

This Compendium contains reports focusing on immigration and border security laws and policy including border control and visa security; legal immigration; documentation and verification; interior immigration enforcement; integration, status, and benefits; and refugees and other humanitarian populations. It delineates the debate in the 112th Congress for a range of issues, including border security, criminal aliens, worksite enforcement, employment eligibility verification, permanent admissions, temporary workers, legalization, noncitizen eligibility for federal benefits, birthright citizenship, and the role of state and local law enforcement in enforcing immigration laws. Current circumstances may sharpen the social and business cleavages as well as narrow the range of options. Nonetheless, selected immigration issues are likely to be a major concern for the 113th Congress, even if legislative action on such contentious issues appears daunting.

Date of Report: January 17, 2013
Number of Pages: 484
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Visa Waiver Program

Alison Siskin
Specialist in Immigration Policy

The visa waiver program (VWP) allows nationals from certain countries to enter the United States as temporary visitors (nonimmigrants) for business or pleasure without first obtaining a visa from a U.S. consulate abroad. Temporary visitors for business or pleasure from non-VWP countries must obtain a visa from Department of State (DOS) officers at a consular post abroad before coming to the United States. Concerns have been raised about the ability of terrorists to enter the United States under the VWP, because the VWP bypasses the first step by which foreign visitors are screened for admissibility to enter the United States. Nonetheless, the current economic climate has heightened interest in the VWP as a mechanism to promote tourism and commerce. In addition to increasing tourism, the inclusion of countries in the VWP may help foster positive relations between the United States and those countries, facilitate information sharing, and ease consular office workloads abroad. As of December 2012, 37 countries participate in the VWP. Taiwan, the most recent entrant, was designated a program country on October 2, 2012.

In FY2011, there were 18.3 million visitors who entered the United States under this program, constituting 40% of all overseas visitors. To qualify for the VWP, statute specifies that a country must offer reciprocal privileges to U.S. citizens; have had a nonimmigrant refusal rate of less than 3% for the previous year or an average of no more than 2% over the past two fiscal years with neither year going above 2.5%; issue their nationals machine-readable passports that incorporate biometric identifiers; certify that it is developing a program to issue tamper-resident, machinereadable visa documents that incorporate biometric identifiers which are verifiable at the country’s port of entry; and not compromise the law enforcement or security interests of the United States by its inclusion in the program. Countries can be terminated from the VWP if an emergency occurs that threatens the United States’ security interests.

All aliens entering under the VWP must present machine-readable passports. In addition, passports issued between October 26, 2005, and October 25, 2006, must have a digitized photo on the data page, while passports issued after October 25, 2006, must contain electronic data chips (e-passports). Under DHS regulations, travelers who seek to enter the United States through the VWP are subject to the biometric requirements of the United States Visitor and Immigrant Status Indicator Technology (US-VISIT) program. In addition, aliens entering under the VWP must get an approval from the Electronic System for Travel Authorization (ESTA), a web-based system that checks the alien’s information against relevant law enforcement and security databases, before they can board a plane to the United States. ESTA became operational for all VWP countries on January 12, 2009.

Under statute, the Secretary of the Department of Homeland Security (DHS) has the authority to waive the nonimmigrant refusal rate requirement, provided certain conditions are met. The waiver became available in October 2008; however, it was suspended on July 1, 2009, because DHS did not implement an air-exit system that incorporates biometric identifiers. The waiver will not be available until such a system is implemented, and it is unknown when and if a biometric exit system will be implemented. In 2008, eight new countries were added to the VWP who needed the nonimmigrant refusal rate waiver to be part of the program. There are other countries (e.g., Poland, Romania, Chile) that have expressed interest in being a part of the VWP who would need a waiver of the nonimmigrant refusal rate. Legislation was introduced in the 112th Congress that would have reinstated the waiver authority and made other changes to the VWP, such as allowing DHS to use overstay rates to determine program eligibility. It is possible that the 113th Congress will consider similar legislation.


Date of Report: January 15, 2013
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Immigration and Border Security: A Compendium

There is a broad-based consensus that the U.S. immigration system is broken. This consensus erodes, however, as soon as the options to reform the U.S. immigration system are debated. Substantial efforts to comprehensively reform immigration law failed in the 109th and 110th Congresses. Whether and how Congress will address immigration reform in the midst of historically high levels of unemployment and budgetary constrictions is difficult to project.

The number of foreign-born people residing in the United States is at the highest level in U.S. history and has reached a proportion of the U.S. population—12.5%—not seen since the early 20th century. Of the 38 million foreign-born residents in the United States, approximately 16.4 million are naturalized citizens. The remaining 21.6 million foreign born residents are noncitizens. According to the latest estimates by the Department of Homeland Security (DHS), about 10.8 million of the 21.6 million noncitizens were unauthorized aliens living in the United States in January 2010, down from a peak of 11.8 million in January 2007. Some observers and policy experts maintain that the presence of millions of unauthorized residents is evidence of inadequacies in the legal immigration system as well as failures of immigration control policies and practices.

This Compendium contains reports focusing on immigration and border security laws and policy including border control and visa security; legal immigration; documentation and verification; interior immigration enforcement; integration, status, and benefits; and refugees and other humanitarian populations. It delineates the debate in the 112th Congress for a range of issues, including border security, criminal aliens, worksite enforcement, employment eligibility verification, permanent admissions, temporary workers, legalization, noncitizen eligibility for federal benefits, birthright citizenship, and the role of state and local law enforcement in enforcing immigration laws. Current circumstances may sharpen the social and business cleavages as well as narrow the range of options. Nonetheless, selected immigration issues are likely to be a major concern for the 113th Congress, even if legislative action on such contentious issues appears daunting.

Date of Report: January 16, 2013
Number of Pages: 484
Order Number: C12003
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Immigration of Foreign Nationals with Science, Technology, Engineering, and Mathematics (STEM) Degrees

Ruth Ellen Wasem
Specialist in Immigration Policy

Although the United States remains the leading host country for international students in science, technology, engineering, or mathematics (STEM) fields, the global competition for talent has intensified. A record number of STEM graduates—both U.S. residents and foreign nationals—are entering the U.S. labor market, and there is a renewed focus on creating additional immigration pathways for foreign professional workers in STEM fields. Current law sets an annual worldwide level of 140,000 employment-based admissions, which includes the spouses and children in addition to the principal (i.e., qualifying) aliens. “STEM visa” is shorthand for an expedited immigration avenue that enables foreign nationals with graduate degrees in STEM fields to adjust to legal permanent resident (LPR) status without waiting in the queue of numerically limited LPR visas. The fundamental policy question is should the United States create additional pathways for STEM graduates to remain in the United States permanently?

The number of full-time graduate students in science, engineering, and health fields who were foreign students (largely on F-1 nonimmigrant visas) grew from 91,150 in 1990 to 148,923 in 2009, with most of the increase occurring after 1999. Despite the rise in foreign student enrollment, the percentage of STEM graduate students with temporary visas in 2009 (32.7%) was comparable to 1990 (31.1%). Graduate enrollments in engineering fields have exhibited the most growth of the STEM fields in recent years. About 40,000 graduate degrees were awarded to foreign STEM students in 2009, with 10,000 of those going to Ph.D. recipients.

After completing their studies, foreign students on F-1 visas are permitted to participate in employment known as Optional Practical Training (OPT), which is temporary employment that is directly related to an F-1 student’s major area of study. Generally, a foreign student may work up to 12 months in OPT status. In 2008, the Department of Homeland Security (DHS) expanded the OPT work period to 29 months for F-1 students in STEM fields.

Many F-1 visa holders (especially those who are engaged in OPT) often change their immigration status to become professional specialty workers (H-1B). Most H-1B beneficiaries are typically admitted to work in STEM occupations. In FY2010, the most recent year for which detailed data on H-1B beneficiaries (i.e., workers renewing their visas as well as newly arriving workers) are available, almost 91,000 H-1B workers were employed in computer-related occupations, and they made up 47% of all H-1B beneficiaries that year.

The H-1B visa and the OPT often provide the link for foreign students to become employmentbased LPRs. In total, foreign nationals reporting STEM occupations made up 44% of all of the 676,642 LPRs who were employment-based principal immigrants during the decade of FY2000- FY2009. Of all of the LPRs reporting STEM occupations (297,668) over this decade, 52% entered as professional and skilled workers. STEM graduates seeking LPR status are likely to wait in line to obtain LPR status. Those immigrating as professional and skilled workers face wait times of many years, but those who meet the criteria of the extraordinary ability or advanced degrees preference categories have a much shorter wait.

STEM visas have gained interest in the 112th Congress, and various bills with STEM visa provisions (H.R. 399, H.R. 2161, H.R. 3146, H.R. 5893, H.R. 6412, S. 1965, S. 1986, S. 3185, S. 3192, and S. 3217) have been introduced. The House Committee on the Judiciary held two hearings on STEM and other high-skilled immigration in 2011. These issues also arose during a 2011 Senate Committee on the Judiciary hearing on the economic rationale for immigration
reform. On September 20, 2012, the STEM Jobs Act of 2012 (H.R. 6429) failed to receive the necessary two-thirds vote to pass under suspension of the rules. Most recently, the House passed a revised version of the STEM Jobs Act of 2012 (H.R. 6429) on November 30, 2012.

Date of Report: December 17, 2012
Number of Pages: 34
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