CBP is the nation’s largest federal law enforcement agency. CBP’s Border Patrol and AMO are the uniformed law enforcement arms responsible for securing U.S. borders between ports of entry in the air, land, and maritime environments. Border Patrol has primary responsibility for securing U.S. land borders between ports of entry. Its area of responsibility along the northern border is divided among eight sectors: Blaine, Spokane, Havre, Grand Forks, Detroit, Buffalo, Swanton, and Houlton. Each Border Patrol sector is further divided into Border Patrol stations and each station is assigned a certain geographic area of responsibility within a sector. Along the northern border, there are a total of 49 stations or between four to eight stations per sector. For a map of Border Patrol’s northern border sectors, see figure 1. Border Patrol agents secure the border between ports of entry, in part, through patrolling international land borders and waterways to detect and prevent the illegal trafficking of people, narcotics, and contraband into the United States. AMO has primary responsibility for securing U.S. borders in the air, marine, and land domains and its operations along the northern border are divided among three branches: Bellingham Air and Marine Branch in Washington, Great Lakes Air and Marine Branch in Michigan, and Manassas Air Branch in Virginia. Each branch is further divided into units to conduct air or maritime missions and there are a total of seven air units and nine marine units along the northern border. For a map of AMO’s northern border operating locations, see figure 2. AMO Air Interdiction Agents are federal law enforcement agents who pilot aircraft, while Marine Interdiction Agents are federal law enforcement agents who operate vessels. Air and Marine Interdiction Agents secure the air and maritime environments along the border, in part, through conducting surveillance and investigative activities to interdict smuggled narcotics and other contraband. Additional offices within CBP that support the activities of Border Patrol and AMO along the northern border include the Office of Facilities and Asset Management, Office of Information and Technology (OIT), and Office of Intelligence. The Office of Facilities and Asset Management is responsible for oversight and management of CBP’s real and personal property portfolios, including managing CBP’s facilities and motor vehicle fleets. OIT is responsible for managing CBP’s technology infrastructure and information technology (IT) operations. These, according to OIT, enable CBP mission readiness and improve the ability of all employees, including agents in the field, to be proactive and responsive to new threats. OIT manages all IT networks, computers, systems, data, tactical communications, and other resources to support CBP employees. OIT is also to provide day-to-day field support primarily through Field Technology Officers who provide services to CBP’s offices and components, such as repairing equipment, upgrading systems and networks, restoring system outages, responding to cybersecurity incidents, and deploying new technology and equipment. The Office of Intelligence is to develop, coordinate, and implement CBP’s intelligence capabilities into a cohesive intelligence enterprise that supports CBP’s primary mission to secure the borders while facilitating legitimate trade and travel. The Office of Intelligence’s Field Intelligence Division is to provide CBP law enforcement personnel with current and relevant intelligence to inform decision makers and those who respond to border related crimes, threats, and hazards. In this division, there are two field intelligence groups with areas of responsibility along the northern border—the Pacific Northwest Field Intelligence Group in Washington and the Great Lakes Field Intelligence Group in Michigan. In addition, through CBP’s National Border Geospatial Intelligence Strategy, the Office of Intelligence produces geospatial intelligence products for Border Patrol sectors to identify areas of potential illicit cross-border activity. Border Patrol and AMO use a variety of technologies, facilities, and other resources to secure the northern border between ports of entry. Figure 3 illustrates examples of resources used by Border Patrol and AMO, which include the following: surveillance technology, such as Remote Video Surveillance Systems—systems of towers with cameras that transmit information to video monitors at a Border Patrol facility—and unattended ground sensors—remotely monitored sensors placed in or on the ground, or on ground-based platforms, to detect, track, identify, and differentiate humans, animals, and vehicles—used by Border Patrol agents to detect and identify illicit cross-border activity; radar systems to detect and identify aircraft and vessel incursions; IT and communication systems to conduct operations and ensure the safety and security of agents while on duty, including databases and systems for processing detainees, infrastructure to operate surveillance technology, and tactical communication equipment such as land mobile radios; aircraft, including fixed- and rotary-wing aircraft, vehicles, including all- terrain vehicles and snowmobiles, and large and small vessels; tactical infrastructure, including fencing, roads, and border markers and signs; and facilities, including buildings to house workstations and offices for agents and civilian personnel, short-term detention facilities to process and hold individuals arrested by Border Patrol agents, forward operating bases in remote locations to support Border Patrol agent operations, and hangars for aircraft and vessel storage and repair. CBP participates in a variety of collaborative efforts—including task forces, joint operations, and partnerships with federal, state, and local law enforcement agencies—to support its efforts to secure the northern border between ports of entry. According to CBP officials, collaborative efforts involve sharing intelligence and other information that informs and guides the efficient use of agents and resources to conduct enforcement activities. For example, AMO’s Air and Marine Operations Center coordinates with federal, state, local, and international law enforcement agencies to detect, identify, track, and coordinate interdiction of suspect aviation and maritime activity near and at the borders, including the northern border, and within the United States. Moreover, Border Patrol’s Northern Border Coordination Center serves as a centralized coordination center for information sharing among Border Patrol’s eight northern border sectors, as well as with domestic and international law enforcement partners, focusing primarily on counter-terrorism and illicit criminal networks. Border Patrol also collaborates with county, state, tribal, local, and other law enforcement agencies through administration of the Operation Stonegarden Grant Program, a part of the Homeland Security Grant Program, to support border security activities. The grant program provides funding to state, local, and tribal law enforcement agencies to support joint efforts to secure U.S. borders. For example, grantees may receive reimbursement for operational overtime costs associated with law enforcement activities and equipment purchases, such as sensors, in support of border security activities. CBP’s collaborative efforts along the northern border also include participation in various task forces with federal, state, and local law enforcement agencies. Specifically, Border Patrol and AMO agents may be assigned as task force officers to conduct or support casework, investigations, and coordination among federal, state, and local law enforcement agencies. For example, Border Patrol and AMO agents are assigned as task force officers along the northern border on the U.S. Immigration and Customs Enforcement-led Border Enforcement Security Task Force in Washington, Michigan, and New York to identify, investigate, disrupt, and dismantle transnational criminal organizations. According to Border Patrol and AMO officials, task force officers help enhance partnerships, information sharing, and situational awareness along the northern border. CBP also partners with other DHS components to support its efforts to secure the northern border between ports of entry. For example, through the Puget Sound Regional Coordinating Mechanism, CBP—including Border Patrol and AMO—and the U.S. Coast Guard coordinate daily and conduct joint operations along the maritime border between the state of Washington and province of British Columbia. CBP also works with DHS’s Science and Technology Directorate to identify, develop, and evaluate technology to address capability gaps across the northern border. For example, DHS’s Science and Technology Directorate, in collaboration with Swanton Border Patrol sector, deployed land surveillance technology along the northern border. CBP also collaborates with law enforcement agencies within the government of Canada through the Cross-Border Law Enforcement Advisory Committee and Integrated Border Enforcement Team Program. The Cross-Border Law Enforcement Advisory Committee is a national- level committee—comprised of the Royal Canadian Mounted Police, Canada Border Services Agency, U.S. Immigration and Customs Enforcement, CBP, and U.S. Coast Guard—that provides guidance to initiatives involving partnerships between United States and Canadian law enforcement agencies along the shared border. The Integrated Border Enforcement Team Program includes the Royal Canadian Mounted Police, Canada Border Services Agency, U.S. Immigration and Customs Enforcement, CBP, and U.S. Coast Guard. According to CBP, the priority of the program is to seek and identify mutual national security threats and combat illicit cross-border activity. According to CBP and government of Canada officials, program activities may include real-time tactical intelligence sharing between Canadian and U.S. law enforcement agencies and periodic meetings to coordinate operations. These officials stated that the program helps to facilitate timely information sharing in accordance with Canadian and U.S. laws and regulations. For example, through the Integrated Border Enforcement Team Charter, Border Patrol and the Royal Canadian Mounted Police may share information related to cross-border criminal activity—such as suspected or known illegal entries between ports of entry—without delay. According to DHS’s 2017 Northern Border Threat Analysis Report, the most common threat to U.S. public safety along the northern border continues to be contraband smuggling; specifically, the bidirectional flow of illicit drugs. In its fiscal year 2018 intelligence reports for its eight northern border sectors, Border Patrol also reported contraband smuggling as a significant threat along the northern border between ports of entry, including bidirectional drug smuggling. According to Border Patrol data for fiscal years 2013 through 2017, 2 percent of Border Patrol’s total drug seizures occurred along the northern border. Examples of smuggling activities include criminal groups with known ties to or hired by Mexican drug trafficking organizations suspected of smuggling narcotics into Canada and smuggling bulk currency from Canada into the United States between land border ports of entry. Border Patrol, in its intelligence reports, also identified contraband smuggling for the purpose of evading customs duties, involving products such as tobacco, prohibited fruits, and medicinal products. Further, according to Border Patrol, criminal organizations smuggle contraband between ports of entry because certain items such as tobacco, agricultural, and medicinal products are prohibited for import even if properly declared at a port of entry. In 2017, AMO reported contraband smuggling across the northern border both into and out of the United States between ports of entry. In its 2017 Northern Border Non-Commercial General Aviation Threat Overview, AMO’s Air and Marine Operations Center identified illicit activity along the northern border using general aviation aircraft, including aircraft operating in a suspicious manner at low attitude (low-flying aircraft). According to Border Patrol’s annual fiscal year 2018 intelligence report, violations of U.S. immigration and travel controls, which Border Patrol refers to generally as “illegal immigration,” along the northern border is a threat and is frequently bidirectional between the United States and Canada. Additionally, our analysis of Border Patrol data from fiscal years 2013 through 2017 showed that Border Patrol agents apprehended 14,319 potentially removable aliens—foreign nationals who Border Patrol suspected or determined were removable from the United States—along the northern border or approximately 1 percent of its total nationwide apprehensions of potentially removable aliens (1.97 million aliens). According to DHS’s 2017 Northern Border Threat Analysis Report, known illegal crossings between ports of entry by individuals on the northern border conform to established migration patterns between large population centers. Further, the report states that terrain, weather, and distance are factors that constrain migrant travel between ports of entry in remote areas of the border. According to Border Patrol officials, the majority of individuals apprehended along the northern border are suspected or known to have illegally entered the United States across the southwest border and traveled to the northern border region before being detected, while a smaller number of individuals are suspected or known to have illegally entered the United States from Canada between ports of entry. Specifically, of the potentially removable aliens apprehended by Border Patrol along the northern border during this period, we found that 61 percent (8,727) were individuals suspected or known to have illegally entered the United States from Mexico, while 19 percent (2,782) were individuals suspected or known to have illegally entered the United States from Canada. The Swanton Border Patrol sector apprehended the highest percentage of individuals who illegally entered the United States from Canada between ports of entry during this period, 43 percent (1,206 individuals) of the total number across all eight northern border sectors. Border Patrol, in its fiscal year 2018 intelligence reports for its eight northern border sectors, also identified alien smuggling—bringing into, or harboring or transporting within, the United States, foreign nationals in violation of U.S. immigration law—organizations operating along the northern border between ports of entry as a threat. Examples of alien smuggling activities include alien smuggling organizations using private residences along international waterways to provide locations for staging an illegal entry. According to Border Patrol officials, criminal organizations operating along the U.S.-Canada border frequently conduct bidirectional alien smuggling activities between the United States and Canada as agents encounter numerous types of groups being smuggled into Canada. CBP identified staffing and resource challenges to its operations and enforcement activities across the northern border and has identified actions to address them, but faces competing priorities. Border Patrol and AMO officials we met with identified agent staffing challenges along the northern border across all sectors and branches that limit enforcement activities, including Border Patrol agent availability to conduct patrol missions and a limited number and frequency of AMO missions due to AMO agent availability. Border Patrol and AMO officials also identified resource challenges along the northern border across all sectors and branches, including radar and surveillance technology used to surveil the air, maritime, and land environments; IT and communication technology, including network infrastructure and bandwidth that allow agents to access CBP systems and tactical communications, such as land mobile radios for agent communication during border security missions; and infrastructure and facilities, including tactical infrastructure—roads, fencing, and border markers—and facilities used by agents to secure the border. It is unknown whether the staffing and resource challenges identified by CBP to secure the northern border between ports of entry will be addressed due to competing southwest border security priorities. CBP identified actions and ongoing efforts to address agent staffing and resource challenges to secure the northern border between ports of entry. In June 2018, DHS released a Northern Border Strategy to establish actions that are intended to, among other things, improve DHS’s efforts to safeguard the northern border against various threats. DHS is developing an implementation plan for its Northern Border Strategy which will, among other things, identify actions to address gaps in capabilities to secure the northern border between ports of entry. However, it is unknown whether CBP’s northern border staffing and resource challenges will be addressed due to competing priorities with southwest border security. For example, instructions in Executive Order 13767 require DHS to obtain complete operational control—prevention of all unlawful entries into the United States, including entries by terrorists, other unlawful aliens, instruments of terrorism, narcotics, and other contraband—of the southwest border, in part through hiring thousands of agents and constructing a physical barrier. Border Patrol officials identified staffing challenges across the northern border sectors that have affected enforcement activities. Officials from northern border sectors told us that an insufficient number of agents authorized or onboard at its sectors and stations limits their ability to conduct enforcement activities and may, at times, pose risks to agent safety. In addition, Border Patrol officials from northern border sectors stated that agent availability for enforcement activities is further limited by detainee transportation and supervision duties and requests for law enforcement assistance from other agencies. For example, Border Patrol sector officials stated that detainee transportation duties result in agents being unable to conduct enforcement activities for up to 1 day and duties related to supervision of detainees during court proceedings and meetings with federal prosecutors may result in agents being unable to conduct enforcement activities for up to 1 week. Further, responding to local calls for assistance during assaults may result in agents being unable to conduct enforcement operations for multiple hours. Also, Border Patrol officials from northern border sectors stated that vacancies in civilian Law Enforcement Communication Assistant positions affect enforcement activities. Law Enforcement Communication Assistant duties at each northern border sector are dispatching and officer safety checks, monitoring surveillance camera feeds and unattended ground sensor activation, and conducting intelligence research checks for agents on duty across all stations in the sector. Border Patrol officials told us it is difficult to recruit and retain qualified applicants for vacant positions due to the lower General Schedule grade of the position across Border Patrol, which is not competitive with salaries for similar positions offered through state and local law enforcement agencies. In August 2018, Border Patrol officials stated that they created an additional position, the Law Enforcement Information Specialist, with additional duties and responsibilities at a higher General Schedule grade. AMO identified staffing challenges across its northern border branches which, according to AMO officials, have affected the frequency and number of air and maritime missions. Specifically, officials at AMO branches told us that an insufficient number of agents authorized or onboard at its branches and units limits the frequency and number of air and maritime missions AMO is able to conduct along the northern border. For example, AMO officials stated that an insufficient number of Marine Interdiction Agents limits the number of daily and weekly maritime patrol missions. For air missions, AMO officials stated that an insufficient number of Air Interdiction Agents may limit the ability to fulfill immediate or previously unscheduled requests for air support. AMO officials from northern border branches also cited agent recruitment, hiring, and retention as a challenge for filling vacant positions. For example, officials stated that AMO faces competition with commercial airline companies for recruitment and retention of qualified individuals with commercial pilot certificates, including higher salaries, as well as delays from CBP’s lengthy application process. AMO officials from northern branches also stated that agent availability for air and maritime missions is sometimes limited due to temporary duty assignments to support national missions, which can limit local operations along the northern border. AMO officials stated that these temporary duty assignments involve relocation of Air Interdiction Agents, aircraft, and maintenance staff to other operating locations for multiple weeks. For example, in 2017, Air Interdiction Agents flew missions to support recovery efforts after the hurricanes in Texas, Florida, and Puerto Rico. In 2018, Air Interdiction Agents supported security operations during the Super Bowl in Minneapolis, Minnesota. CBP is taking actions to address agent recruitment, hiring, and retention. We reported in June 2018 on CBP’s actions to address challenges for recruitment, hiring, and retention of Border Patrol and AMO agents, such as increased participation in recruitment events and offering relocation opportunities for existing employees. According to CBP’s Fiscal Year 2019 Congressional Budget Justification, newly hired Border Patrol agents will be assigned to the southwest border to allow for the reassignment of more experienced agents to the northern border. As of August 2019, Border Patrol officials expected that all sectors in fiscal year 2019, including the northern border sectors, would receive an increase in the number of authorized agent positions. Border Patrol officials also stated that as of June 2018, they were completing a Personnel Requirements Determination Initiative to analyze agent allocations across its sectors and stations to develop a staffing allocation model to optimally align staff according to workload and area of responsibility conditions. In June 2018, we also reported that AMO had taken steps to address staffing challenges, such as implementing voluntary paid relocation opportunities and pursuing additional human capital flexibilities to address its difficulty in retaining Air Interdiction Agents, including a group retention incentive and a special salary rate. AMO personnel who are non- bargaining unit employees and have served for at least 3 years in their current location are also eligible for noncompetitive paid relocations. According to AMO officials, these opportunities are posted every few months and eligible personnel can apply for transfers to a specific duty station based on the needs of the operational component. In September 2017, AMO submitted an official request for a 10 percent group retention incentive for Air Interdiction Agents staffed to the northern border, among other locations. According to the request, the incentive is intended to help AMO retain qualified pilots in these hard-to-fill locations by raising their salaries to be more competitive with commercial airlines. Border Patrol officials we met with stated that Border Patrol’s Operational Mobility and Resident Agent Programs have helped northern border sectors to address agent staffing challenges. The Operational Mobility Program provides Border Patrol agents with opportunities for a paid relocation to a more desirable location at a lower cost to CBP than an official permanent change of station transfer. Border Patrol officials stated that the use of the Operational Mobility Program resulted in agents electing to relocate to northern border sectors from other duty stations. The Resident Agent Program operates in locations where Border Patrol’s routine presence is extremely limited and is intended to improve situational awareness by the creation of partnerships, expansion of community outreach, and development and dissemination of intelligence. The Resident Agent location is the physical residence of an agent in a location where there is not an official Border Patrol station. Officials from Border Patrol sectors and AMO branches stated that there are gaps in air radar coverage along the northern border, limiting their ability to detect and identify aircraft incursions. CBP has taken actions to address these gaps in air radar coverage. In December 2017, CBP completed an AMO-led assessment of air radar capabilities, which identified coverage gaps and needs across the United States, including at the northern border. In May 2018, AMO officials stated that they began working with the Department of Defense to test technology along the northern border to address gaps in air radar coverage. Officials from Border Patrol sectors and AMO branches stated that there are limited maritime radar capabilities to detect and identify vessel incursions along the northern border. CBP has taken actions to address these gaps in maritime radar capabilities. Border Patrol, through its Maritime Detection Project, plans to deploy additional maritime radar technology in Detroit and Buffalo sectors to expand maritime radar coverage on Lake Erie. Also, in 2017, CBP participated in a 1-year DHS pilot project with the government of Canada to share radar information in an area along the northern border to detect vessel incursions. AMO, through its Multi-Role Enforcement Aircraft, conducts maritime radar patrols along portions of the northern border to address gaps in maritime radar coverage on some of the Great Lakes and parts of the Pacific Northwest, to detect and identify vessel incursions. Border Patrol sector officials stated that there are challenges with land surveillance technology that is used for agents to detect, identify, and respond to illicit cross-border activity along the northern border. Further, Border Patrol headquarters and sector officials stated that there are gaps in surveillance technology coverage along the northern border to detect and identify illicit cross-border activity. In addition, Border Patrol officials also identified challenges with Legacy Remote Video Surveillance Systems. For example, officials we met with identified system outages due to delays in maintenance and replacement of parts, and poor quality video surveillance camera images. In March 2017, CBP completed a Border Patrol-led assessment of land surveillance capabilities to assess gaps, including gaps in surveillance technology coverage across all Border Patrol sectors. Officials from Border Patrol sectors and AMO branches we met with identified inadequate network infrastructure—including network infrastructure and equipment nearing or past its useful life—and bandwidth that have affected enforcement activities and other required tasks along the northern border. For example, Border Patrol officials stated that inadequate network infrastructure and bandwidth has delayed or prevented the processing of detainees at some stations. AMO officials also stated that inadequate bandwidth limits the ability of agents to use BigPipe, a system used to coordinate operations with partner agencies during air and maritime missions. In September 2017, DHS’s Office of Inspector General found that outdated IT infrastructure and equipment contributed to CBP-wide system performance and availability challenges; a considerable portion of IT equipment and infrastructure had reached its useful life; and OIT was unable to replace infrastructure past its useful life because of financial constraints. CBP’s Fiscal Year 2019 Congressional Budget Justification identifies actions to improve network infrastructure and bandwidth, including deploying new workstations and replacing network infrastructure components that are past their useful life to provide reliable operations and address vulnerabilities. OIT officials stated that pilot projects using virtual private network connections are being implemented at CBP locations to address bandwidth challenges and reduce costs. Officials from Border Patrol sectors and AMO branches we met with identified challenges with tactical communications, including gaps in land mobile radio coverage along the northern border. Border Patrol and AMO agents responsible for securing the northern border depend on land mobile radio systems for secure, reliable, and timely exchanges of critical information to effectively carry out their mission. Border Patrol and AMO officials we met with identified lack of coverage in certain areas, which impacts agent communication during enforcement activities. CBP has taken actions to identify coverage gaps and deploy additional equipment to improve communications coverage along the northern border. For example, CBP has deployed additional equipment to improve tactical communication coverage in Border Patrol’s Houlton sector in Maine through its Tactical Communication Modernization Program from fiscal years 2009 through 2017. Border Patrol officials stated that they are deploying repeater tower sites—technology used for retransmitting and extending the range of radio communications—and other technology to mitigate dead spots and gaps in coverage in three sectors. According to CBP’s Fiscal Year 2019 Congressional Budget Justification, updated handheld and mobile radios are being provided to Border Patrol and AMO, including northern border locations, to improve tactical communications and interoperability with law enforcement partners. Border Patrol sector officials identified challenges due to limited tactical infrastructure, such as a lack of barriers to impede vehicle incursions and access to roads along the border that make it difficult to impede illegal entries. For example in one sector, officials stated that a lack of vehicle barriers leads to a gap in Border Patrol’s ability to impede illicit vehicle incursions. In other sectors, officials stated that Border Patrol agents face challenges accessing border areas due to a lack of roads or access to maintained roads. Officials from northern border sectors also stated that agents face challenges preventing illegal entries due to a lack of barriers and a lack of signs or markers indicating the location of the international border. Officials from Border Patrol sectors and AMO branches we met with noted that certain facilities do not have space to accommodate the number of assigned agents and civilian personnel along the northern border. For example, in one sector, officials stated that there is lack of space to accommodate Law Enforcement Communication Assistants to monitor surveillance technology and direct agents to respond to potential illicit activity. Border Patrol officials in other sectors also stated that certain stations in their sectors do not have adequate facilities to process and house detainees. For example, one station lacks a dedicated processing and interview area and detainees are processed in an open location next to agent workstations, which may pose a safety risk to agents, according to officials. In November 2018, Office of Facilities and Asset Management officials identified 20 new and major construction projects planned for the northern border, including replacement of Border Patrol facilities with identified challenges; however, these projects have been deferred due to lack of funding. Further, according to Office of Facilities and Asset Management officials, CBP has insufficient funds to address deferred maintenance projects and a limited number of maintenance staff to repair facilities. Officials from Border Patrol sectors we met with identified aging vehicles that are beyond their expected service life, which affect enforcement activities along the northern border. According to Border Patrol officials, funding is not available to replace aging vehicles across all sectors, but funds are allocated annually to replace a percentage of vehicles in the northern border sectors that are beyond their expected service life. Further, Border Patrol officials stated that the harsh climate along the northern border creates additional burdens on agent vehicles prior to those vehicles reaching the end of their expected service life. Officials from Border Patrol sectors we met with identified agent vehicles that lack the technology needed to complete monthly motor vehicle utilization reports required by the DHS Stop Asset and Vehicle Excess Act. In August 2018, Border Patrol officials stated that CBP was in the process of awarding a contract for installation of vehicle reporting technology in agent vehicles, including across the northern border sectors. In addition to the actions identified above by CBP to address northern border staffing and resource challenges, DHS is developing an implementation plan for its Northern Border Strategy, which includes a goal to enhance border security operations. The strategy states that the implementation plan is intended to outline roles, responsibilities, programs, and timelines for accomplishing the strategy’s goals and objectives for fiscal years 2020 to 2024. According to DHS officials, the department plans to use the strategy and corresponding implementation plan to prioritize departmental resources and achieve the specified outcomes over the 5-year period. According to DHS officials, the implementation plan is expected to be completed in 2019 and will identify actions to address gaps in capabilities to secure the northern border between ports of entry; for example, gaps in domain awareness and associated technology, among other things. It is unknown whether the staffing and resource challenges identified by CBP to secure the northern border between ports of entry will be addressed due to competing southwest border security priorities. According to Border Patrol and AMO headquarters officials, resources are allocated across their operating areas based on threats and volume of illicit activity, which are greatest on the southwest border. Further, Border Patrol and AMO headquarters officials stated that resource allocation is prioritized to the southwest border to also meet instructions in Executive Order 13767 to obtain complete operational control—prevention of all unlawful entries into the United States, including entries by terrorists, other unlawful (i.e. inadmissible) aliens, instruments of terrorism, narcotics, and other contraband—of the southwest border. While DHS is implementing its Northern Border Strategy, including developing an implementation plan, addressing CBP’s northern border staffing and resource challenge will compete with its other enforcement priorities along the southwest border. While CBP has performance measures (strategic and management) that assess certain border security operations or programs, some of which include data from the northern border, it does not have specific measures to assess its effectiveness at securing the northern border between ports of entry. More specifically, Border Patrol has two strategic measures that include data from the northern border, but these measures do not assess Border Patrol’s effectiveness at securing the northern border between ports of entry. The two measures—the percent of recurring border surveillance implemented in remote, low-risk areas between ports of entry and the percent of time Border Patrol meets its goal of responding to potential illegal activity in remote, low-risk areas—are based on information from CBP’s National Border Geospatial Intelligence Strategy. The measures assess Border Patrol’s use of reports developed using geospatial intelligence technology of potential illicit cross-border activity. However, this technology is not applied in maritime environments, so the measures do not include data from two northern border sectors. Further, Border Patrol’s two strategic measures combine data from the southwest and northern borders. Border Patrol has four management measures that also contain data from the northern border. These measures are (1) the number of joint operations conducted along the northern border by Border Patrol agents and Canadian law enforcement; (2) the percent of apprehensions at Border Patrol checkpoints; (3) the percent of Border Patrol agents who are trained and certified to perform enforcement actions; and (4) the percent of Border Patrol equipment assessed as ready to support law enforcement operations. Border Patrol’s four management measures include data from the northern border, but do not assess Border Patrol’s effectiveness at securing the northern border between ports of entry. Although one management measure tracks the number of joint operations conducted along the northern border by Border Patrol agents and Canadian law enforcement personnel, that measure does not assess Border Patrol’s performance in conducting those joint operations or their effectiveness. Border Patrol’s three additional management measures include data from the northern border combined with other areas, such as the southwest border, and therefore are not specific to the northern border. AMO’s one strategic and one management measure include data from the northern border, but do not assess AMO’s effectiveness at securing the northern border between ports of entry in the air and maritime environments. For the strategic measure, AMO reports the percent of detected conventional aircraft incursions resolved. The measure represents the percent of conventional aircraft detected visually or by sensor technology, suspected of illicit cross-border activity, which are brought to a successful resolution by its Air and Marine Operations Center. For the management measure, AMO reports air mission launch rate, which is the percent of all requests made for aircraft to which AMO was able to respond. These two measures include data across all border areas, including the northern border, but are not specific to the northern border. Border Patrol officials stated that they have not developed or implemented performance measures to assess their effectiveness at securing the northern border between ports of entry because of competing priorities related to developing measures for southwest border security. According to Border Patrol officials responsible for developing and implementing performance measures, Border Patrol’s priority is to develop measures to assess the effectiveness of its efforts to secure the southwest border, such as the effort to achieve complete operational control as outlined in the Executive Order 13767 instructions and the fiscal year 2018 DHS agency priority goal. Specifically, Border Patrol is required to implement a measure to assess operational control for all southwest border sectors by the end of fiscal year 2019. Border Patrol defines operational control as its ability to impede or deny illegal border crossings, maintain situational awareness, and apply appropriate, time- bound law enforcement response and resolution between the ports of entry. According to Border Patrol officials, the ongoing efforts to develop measures for the southwest border will eventually be applied to the northern border, but it is unknown how these ongoing efforts will be implemented to assess Border Patrol’s performance at securing the northern border between ports of entry. Border Patrol officials stated that following the implementation of operational control for the southwest border, Border Patrol plans to implement the operational control measure along the northern border in fiscal year 2020. Border Patrol officials stated that they are in the early stages of this process, and could not provide any information on how operational control will be implemented for its operations along the northern border. Further, Border Patrol officials could not provide information on how operational control will be used to assess Border Patrol’s performance for securing the northern border between ports of entry. Additionally, in 2012 we recommended that Border Patrol establish milestones and time frames for developing performance measures to support implementation of its 2012-2016 Strategic Plan, including assessing progress made in securing the northern border between ports of entry and informing resource identification and allocation efforts. DHS concurred with our recommendations, and Border Patrol made progress in developing new performance measures for border security. However, we closed the recommendations as not implemented in September 2017 because the measures identified did not apply to the entire northern or coastal borders, as well as the remaining uncertainty about when Border Patrol would develop a new strategic plan. AMO officials stated that they have not implemented performance measures to assess AMO’s effectiveness at securing the northern border between ports of entry in the air and maritime environments because of difficulties in creating region-specific performance targets. Specifically, AMO officials stated that it is difficult to set performance targets for a specific region, such as the northern border, because the threat environment is constantly changing. Also, the officials stated that AMO is waiting for completion of the Northern Border Strategy implementation plan before developing any performance measures specific to the northern border. Additionally, Border Patrol and AMO have ongoing efforts to develop border security metrics pursuant to the National Defense Authorization Act for Fiscal Year 2017. The act directs DHS to annually report metrics and associated data and methodology, including metrics for border security between ports of entry. Consistent with GPRAMA, agencies should establish a balanced set of performance measures, which reinforces the need for agencies to have a variety of measures across program areas. Furthermore, Standards for Internal Control in the Federal Government state that management should determine whether performance measures for the defined objectives are appropriate for evaluating the entity’s performance using targets and milestones. The standards also state that management should track entity achievements and compare actual performance to planned or expected results using established activities such as comparisons and assessments. Border Patrol and AMO could leverage and use their ongoing efforts to develop and implement performance measures to assess effectiveness at securing the northern border between ports of entry. For example, Border Patrol and AMO could use the metrics developed in accordance with the Fiscal Year 2017 National Defense Authorization Act to help inform the development of northern border performance measures. Developing and implementing such measures could help Border Patrol and AMO better assess the effectiveness of their northern border operations between ports of entry, including challenges due to limited staffing and resources, and take corrective actions, as necessary. The United States and Canada share the longest common non-militarized border between two countries, spanning nearly 4,000 miles; however, CBP has historically focused attention and resources, including resources to develop and implement performance measures, primarily on the nearly 2,000 mile U.S.-Mexico border. While Border Patrol and AMO have performance measures that assess specific border security operations or programs that include data from the northern border, these measures generally combine data with other border regions and collectively the measures do not assess effectiveness at securing the northern border between ports of entry. Without northern border performance measures, Border Patrol and AMO cannot assess their effectiveness at securing the northern border between ports of entry. Developing and implementing northern border performance measures could help Border Patrol and AMO assess its northern border operations and address identified challenges. We are making two recommendations, one to Border Patrol and one to AMO. The Chief of Border Patrol should develop and implement performance measures to assess its effectiveness at securing the northern border between ports of entry (Recommendation 1). The Executive Assistant Commissioner of AMO should develop and implement performance measures to assess its effectiveness at securing the northern border between ports of entry in the air and maritime environments (Recommendation 2). We provided a draft of this report to DHS for review and comment. DHS provided written comments, which are reproduced in full in appendix V, and technical comments, which we incorporated as appropriate. DHS concurred with both recommendations in the report and described actions Border Patrol and AMO plan to take in response. Border Patrol plans to develop and apply a measure of operational control to its northern border sectors; however, to meet the intent of our recommendation, Border Patrol will also need to use its measure of operational control to assess its effectiveness at securing the northern border between ports of entry. AMO plans to develop a performance measure to assess its effectiveness at securing the northern border between ports of entry and seek DHS approval through completion of a Performance Measure Definition Form. These actions, if effectively implemented by AMO, should address the intent of the recommendation. We are sending copies of this report to the appropriate congressional committees and the Acting Secretary of the Department of Homeland Security. In addition, the report is available at no charge on the GAO website at http://www.gao.gov. If you or your staff have any questions about this report, please contact me at (202) 512-8777 or gamblerr@gao.gov. Contacts points for our Offices of Congressional Relations and Public Affairs may be found on the last page of this report. GAO staff who made key contributions to this report are listed in appendix VI. This report addresses the following questions: 1. What threats has U.S. Customs and Border Protection (CBP) identified along the U.S.-Canada (northern) border between ports of entry? 2. What challenges, if any, has CBP identified in its staffing and resources to secure the northern border between ports of entry, and what actions, if any, has CBP taken to address those challenges? 3. To what extent has CBP developed and implemented performance measures to assess the effectiveness of securing the northern border between ports of entry? To address all three questions, we interviewed Department of Homeland Security (DHS) and CBP officials from headquarters and field locations. Specifically, we met with headquarters officials from DHS’s Office of Strategy, Policy, and Plans; Office of Program Analysis and Evaluation; Science and Technology Directorate; U.S. Coast Guard; and U.S. Immigration and Customs Enforcement. From CBP, we met with headquarters officials from the Air and Marine Operations (AMO), U.S. Border Patrol (Border Patrol), Office of Information and Technology, Office of Intelligence, Office of Facilities and Asset Management, and Office of Accountability/Performance Management and Analysis Division. We also met with officials from the government of Canada to discuss their views on northern border security. For a list of government agencies and entities interviewed in field locations, see table 1. In addition, we conducted site visits in Michigan, New York, Vermont, Virginia, and Washington, as well as the Canadian provinces of British Columbia, Ontario, and Quebec. We chose these locations based on deployment of CBP resources—surveillance technology such as Remote Video Surveillance Systems—and reported levels of illicit cross-border activity by Border Patrol, including arrests of individuals and seizures of narcotics. Findings from our site visits cannot be generalized to all CBP locations along the northern border, but provide valuable insights into our research questions. To address the first question, we reviewed DHS and CBP policies, procedures, reports, and assessments describing threats along the northern border between ports of entry. Specifically, we reviewed DHS’s 2017 Northern Border Threat Analysis Report and the June 2018 Northern Border Strategy. We reviewed Border Patrol policies and procedures related to identifying and documenting threats and intelligence reports, referred to as Intelligence Estimates, completed in each northern border sector for fiscal years 2017 and 2018. In addition, we reviewed Border Patrol’s national intelligence estimates for fiscal years 2017 and 2018. We also reviewed documents describing the results of Border Patrol’s Threats, Targets, and Operations Assessments and Intelligence Preparation for the Operation Environment process completed for northern border sectors from 2014 through 2017. To analyze the number apprehensions and drug seizures along the northern border, we obtained data from the Enforcement Integrated Database for fiscal years 2013 through 2017, a time period for which complete data were available at the time of our review. We assessed the reliability of apprehension and seizure data by performing electronic testing for obvious errors in accuracy and completeness, reviewing existing information about the data and the systems that produced them, and interviewing agency officials knowledgeable about the data. As a result of our data reliability assessment, we determined that Border Patrol’s apprehension and seizure data were sufficiently reliable for our intended use. From AMO, we reviewed the 2017 Northern Border Non- Commercial General Aviation Threat Overview and information collected by the Air and Marine Operations Center on vessel and aircraft border incursions detected along the northern border from fiscal years 2013 through 2017. To address the second question, we reviewed CBP’s Fiscal Year 2019 Congressional Budget Justification. We also reviewed the results from Border Patrol’s capability gap assessment process for all eight northern border sectors completed for fiscal year 2017 and associated operational plans completed in September 2018; Border Patrol’s Surveillance Capability Assessment completed in April 2017; and AMO’s capability gap assessment completed in fiscal year 2016. We reviewed CBP capability analysis reports which included requirements along the northern border. In addition, we reviewed our relevant past work and DHS Office of Inspector General reports on northern border security. To determine the staffing and resource challenges across all eight northern border sectors and three AMO branches, we also met with officials at each sector and branch and reviewed supporting documentation. Specifically, we analyzed responses provided by officials in all eight northern border sectors and three AMO branches and supporting documentation to determine challenges mentioned by officials at two or more locations. We also reviewed supporting documentation, including inventories of assets such as vehicles, vessels, aircraft, radar and land surveillance technology, tactical communication equipment, and facilities information. We obtained Border Patrol, AMO, and Office of Information and Technology staffing information as of September 1, 2018, the most recent data available at the time of our review, including the number of authorized, onboard, and vacant positions. To assess the reliability of this staffing information, we examined the information for any anomalies and interviewed agency officials knowledgeable about the data. We found the staffing information data were sufficiently reliable for our purposes of reporting the number of authorized, onboard, and vacant positions. To address the third question, we reviewed and analyzed documentation that describes DHS and CBP processes for developing and implementing performance measures, including DHS’s Annual Performance Report for Fiscal Years 2017-2019, CBP’s Fiscal Year 2019 Congressional Budget Justification, and Performance Measure Definition Forms for recently developed performance measures. We reviewed reports, assessments, and strategies that describe current DHS and CBP performance measure initiatives. We also reviewed information from CBP’s National Border Geospatial Intelligence Strategy, including information on reports derived from geospatial intelligence technology, used as the basis for two of Border Patrol’s performance measures that contain data from the northern border. Additionally, we reviewed DHS’s most recent border security metrics report. We compared CBP’s actions to develop and implement performance measures to Standards for Internal Control in the Federal Government and the principles outlined in Government Performance and Results Act (GPRA) Modernization Act of 2010. We compiled the descriptive information in the northern Border Patrol sector profiles in appendix II from a variety of sources. We obtained information on each sector’s geography and area of responsibility from Border Patrol documentation. We obtained information on the number of authorized agents from Border Patrol as of September 1, 2018. We obtained information on the major urban areas within each sector and population estimates from the U.S. Census Bureau and the data are current as of July 1, 2017, the most recent estimates available at the time of our review. Finally, we obtained geographic information on the location of each northern Border Patrol sector and its stations from Border Patrol and located the data geographically using MapInfo. To analyze the number of apprehensions and drug seizures for each northern Border Patrol sector, we obtained data from the Enforcement Integrated Database for fiscal years 2013 through 2017, a time period for which complete data were available at the time of our review. The data fields we obtained included the individual’s immigration status at entry and country of citizenship and the drug type and quantity in pounds seized. Our analysis categorizes the sector’s apprehensions by the top four to six countries of citizenship of the individuals apprehended by Border Patrol and their immigration status at entry. Present without admission from Canada indicates the individual was suspected to be inadmissible for illegally entering the United States from Canada; present without admission from Mexico indicates the individual was suspected to be inadmissible for illegally entering the United States from Mexico; and the other category is a combination of all remaining categories, such as lawful permanent residents or other foreign nationals who may or may not be lawfully present in the United States. Our analysis also categorizes the sector’s number of drug seizures by the top three to six types of drugs that Border Patrol seized most frequently, as well as the quantity in pounds of those seizures. We assessed the reliability of apprehension and seizure data by performing electronic testing for obvious errors in accuracy and completeness, reviewing existing information about the data and the systems that produced them, and interviewing agency officials knowledgeable about the data. As a result of our data reliability assessment, we determined that Border Patrol’s apprehension and seizure data were sufficiently reliable for our intended use. We compiled the descriptive information in the northern region AMO branch profiles in appendix III from information provided by each branch and AMO headquarters. We obtained information on staffing for the three northern border branches as of September 2018. We obtained the geographic information on location of each northern region AMO branch and unit from AMO and located the data geographically using MapInfo. For total flight and float hours across all AMO operating locations and regions, we reviewed CBP data on flight and float hours from fiscal years 2013 through 2017, a time period for which complete data were available at the time of our review. For Border Patrol riverine float hours across all locations, we reviewed and analyzed float hour data from fiscal year 2017, the most recent year for which complete data were available at the time of our review. For data on air and marine missions across AMO’s northern region branches and units, we reviewed CBP data on seizures of narcotics, apprehensions, and arrests from fiscal years 2013 through 2017, a time period for which complete data were available at the time of our review. To determine the reliability of CBP’s data on flight and float hours, and mission information for seizures of narcotics, apprehensions, and arrests data, we examined the data for any anomalies, reviewed CBP guidance and documents for data collection and entry, and interviewed CBP officials to understand their methods for collecting, reporting, and validating the data. We found these data were sufficiently reliable for our purposes of reporting summary data across fiscal years 2013 through 2017. To obtain information on irregular northbound migration in appendix IV, we met with DHS and Border Patrol officials—including the three sectors (Blaine, Grand Forks, and Swanton sectors) with the highest reported levels of irregular northbound migration at the time of our review—and reviewed intelligence reports and assessments. We obtained the descriptive information in appendix IV on irregular northbound migration from a variety of sources. For data from the government of Canada on the number of asylum claimants, we downloaded publicly reported summary data on asylum claimants from the government of Canada for 2012 through 2017. For data on the number of individuals illegally entering Canada between ports of entry known to Border Patrol, we collected and reviewed information from Blaine, Grand Forks, and Swanton sectors for calendar years 2012 through 2017. To determine the reliability of data, we interviewed officials at each sector to understand their methods for collecting, reporting, and validating the data. According to Border Patrol officials at Blaine, Grand Forks, and Swanton sectors, the number of individuals illegally entering Canada between ports of entry was tracked through agent reporting and detection by land surveillance technology, such as surveillance cameras and unattended ground sensors. Based on Border Patrol’s methods for collecting, reporting, and validating the data, we found these data were sufficiently reliable for our purposes of reporting summary-level data. The performance audit upon which this report is based was conducted from October 2017 to March 2019 in accordance with generally accepted government auditing standards. Those standards require that we plan and perform the audit to obtain sufficient, appropriate evidence to provide a reasonable basis for our findings and conclusions based on our audit objectives. We believe that the evidence obtained provides a reasonable basis for our findings and conclusions based on our audit objectives. We subsequently worked with DHS from March 2019 to June 2019 to prepare this nonsensitive version of the original sensitive report for public release. To provide a descriptive overview of the northern border sectors, we developed a profile for each of the eight U.S. Border Patrol (Border Patrol) sectors located along the U.S.-Canada (northern) border: Blaine, Washington; Spokane, Washington; Havre, Montana; Grand Forks, North Dakota; Detroit, Michigan; Buffalo, New York; Swanton, Vermont; and Houlton, Maine. These profiles are listed in order from the western-most sector to the eastern-most sector and contain an overview of each sector’s geography and area of responsibility and an analysis of apprehensions and drug seizures from fiscal years 2013 through 2017. Within U.S. Customs and Border Protection (CBP), Air and Marine Operations (AMO) conducts multifaceted missions consisting of direct support to U.S. Border Patrol (Border Patrol) and collaborative efforts with U.S. Immigration and Customs Enforcement’s Homeland Security Investigations and other federal, state, and local partner agencies. This includes, but is not limited to, investigative operations, surveillance missions, warrant service, and criminal apprehensions. AMO conducts missions along the U.S.-Canada (northern) border through three branches: Bellingham Air and Marine Branch in Bellingham, Washington; Great Lakes Air and Marine Branch at Selfridge Air National Guard Base, Michigan; and Manassas Air Branch in Manassas, Virginia. Each branch is further divided into units to conduct air or maritime missions. According to AMO data for fiscal years 2013 through 2017, AMO’s Northern Region accounted for 14 percent and 22 percent of total AMO flight and float hours, respectively, as shown in table 10. AMO implements a requirements determination process for annual aircraft flight and vessel float hours based on known mission requirements, funding levels, available assets, and the needs of law enforcement partners. Further, flight and float hours allocated across AMO’s regions are prioritized through CBP’s Flight and Float Hour Executive Oversight Council, which prioritizes flight and float hour allocations considering Department of Homeland Security and CBP’s strategic objectives and border security requirements, threats, and capacity that will be executed over the course of the upcoming year. In February 2018, CBP also created the Flight and Float Hour Executive Steering Committee comprised of Border Patrol and AMO executive leadership to perform periodic audits of flight hour execution, review changing operational environments, validate planning assumptions, and perform an evaluation on overall return on investment to best ensure that CBP asset utilization is consistently aligned with its priorities and threats. AMO’s Bellingham Air and Marine Branch is located in Bellingham, Washington, and is comprised of the Spokane and Montana Air Units and Port Angeles and Bellingham Marine Units. For a map of those operating locations, see figure 20. As of the end of September 2018, Bellingham Air and Marine Branch had 38 authorized Air Interdiction Agent positions and 20 authorized Marine Interdiction Agent positions. According to data provided by AMO for fiscal years 2013 through 2017, missions completed by Bellingham Air and Marine Branch resulted in: 51 apprehensions of potentially removable aliens; 963 arrests of individuals; and 536 drug seizures, including: 204 methamphetamine seizures (1,033 pounds); 93 cocaine seizures (778 pounds); 155 heroin seizures (305 pounds); 65 marijuana seizures (14,132 pounds); and 19 other drug seizures (608 pounds). AMO’s Great Lakes Air and Marine Branch is located at Selfridge Air National Guard Base, Michigan and is comprised of the Buffalo and Chicago Air Units and the Sault Sainte Marie, Port Huron, Trenton, Sandusky, Erie, Buffalo, and Rochester Marine Units. For a map of those operating locations, see figure 21. As of September 2018, Great Lakes Air and Marine Branch had 27 authorized Air Interdiction Agent positions and 49 authorized Marine Interdiction Agent positions. According to data provided by AMO for fiscal years 2013 through 2017, missions completed by Great Lakes Air and Marine Branch resulted in: 157 apprehensions of potentially removable aliens; 2,571 arrests of individuals; and 1,475 drug seizures, including: 553 marijuana seizures (6,974 pounds); 474 cocaine seizures (4,408 pounds); 296 heroin seizures (425 pounds); 87 methamphetamine seizures (1,347 pounds); and 65 other drug seizures (107 pounds). AMO’s Manassas Air Branch is located in Manassas, Virginia, and is comprised of the New York, Plattsburgh, and Houlton Air Units. For a map of those operating locations, see figure 22. As of September 2018, Manassas Branch had 35 authorized Air Interdiction Agent positions. According to data provided by AMO for fiscal years 2013 through 2017, missions completed by Manassas Air Branch resulted in: 57 apprehensions of potentially removable aliens; 1,347 arrests of individuals; and 472 drug seizures, including: 161 marijuana seizures (12,015 pounds); 141 heroin seizures (141 pounds); 134 cocaine seizures (707 pounds); 25 methamphetamine seizures (39 pounds); and 11 other drug seizures (107 pounds). Irregular northbound migration—northbound movement of foreign nationals from the United States across the northern border into Canada between official ports of entry typically to make an asylum claim— increased in 2017. Specifically, in 2017 the Royal Canadian Mounted Police reported approximately 20,000 irregular northbound migrants intercepted between official ports of entry. The majority of interceptions were reported in the province of Quebec (91 percent) with additional interceptions noted in Manitoba (5 percent) and British Columbia (3 percent). In comparison, from 2012 to 2016 the total number of asylum claimants for all of Canada (including at and between official ports of entry) ranged from approximately 10,000 to 24,000 per year. The total number of asylum claimants for all of Canada (including at and between official ports of entry) increased from approximately 24,000 claimants in 2016 to approximately 50,000 claimants in 2017. According to Border Patrol officials, in 2017 the number of individuals crossing from the United States into Canada, other than those crossing through official ports of entry, increased within 3 of 8 Border Patrol sectors along the northern border: Blaine, Washington; Grand Forks, North Dakota; and Swanton, Vermont. Blaine Border Patrol Sector. The number of individuals entering Canada between official ports of entry in British Columbia, north of Blaine sector’s area of responsibility, known to Border Patrol was approximately 1,200 individuals during the 4-year period from 2012 through 2015, according to sector officials. In 2016, the number of individuals known to Blaine sector increased to approximately 1,100 individuals, and then increased again to approximately 1,400 individuals in 2017. Grand Forks Border Patrol Sector. The number of individuals entering Canada between official ports of entry in Manitoba, north of Grand Forks sector’s area of responsibility, known to Border Patrol was approximately 580 individuals during the 4-year period from 2012 through 2015, according to sector officials. In 2016, the number of individuals known to Grand Forks sector increased to approximately 400 individuals, and then increased to approximately 1,000 individuals in 2017. Swanton Border Patrol Sector. The number of individuals entering Canada between official ports of entry in Quebec, north of Swanton sector’s area of responsibility, known to Border Patrol was approximately 1,000 individuals during the 4-year period from 2012 through 2015, according to sector officials. In 2016, the number of individuals known to Swanton sector increased to approximately 1,100 individuals, and then increased to approximately 16,800 individuals in 2017. According to Swanton Border Patrol Sector officials, the majority of known entries into Canada by irregular northbound migrants between official ports of entry have occurred along Roxham Road in Champlain, New York. For a photo of a facility constructed by the government of Canada to process irregular northbound migrants north of Roxham Road, see figure 23. Department of Homeland Security (DHS) and Border Patrol officials we met with identified a bi-national agreement associated with the increased number of irregular northbound migrants from the United States to Canada from 2016 through 2017. Irregular northbound migrants entering Canada between official ports of entry are not subject to the framework established by the 2002 Safe Third Country Agreement signed by Canada and the United States, which governs the processing of asylum claims along the shared land border and applies only to those individuals entering at an official port of entry, not between ports of entry. Therefore, individuals who enter Canada by land between official ports of entry to make an asylum claim may be allowed to stay in Canada rather than have their claim handled by the United States. Individuals seeking to travel to Canada to make an asylum claim, whether or not they may have a valid asylum claim, are made aware of the potential ability to enter and remain in Canada pending an asylum decision due to wide sharing of this information through social media and reporting in the press. Otherwise, for those attempting to enter Canada through an official land port of entry to claim asylum, claimants may be returned to pursue their asylum claim in the country of last presence, which would be the United States, unless they qualify for one of the exceptions in the agreement. According to DHS officials, Canadian data indicates a large percentage of irregular northbound migrants had previously obtained nonimmigrant visas, primarily B1/B2 visas, which authorized their temporary travel to the United States, and subsequently entered Canada between official ports of entry to claim asylum. DHS, in collaboration with the U.S. Department of State, worked to identify, and as appropriate, revoke visas of individuals seeking to enter Canada between official ports of entry. Border Patrol intelligence reporting in 2017 identified visa fraud concerns because individuals obtained visas to enter the United States, when it appeared that their main intention was to enter Canada other than through a port of entry and claim asylum. Border Patrol officials stated that the widespread perception among irregular northbound migrants they encounter is that Canada’s asylum policies are more welcoming than those of the United States, which has also contributed to the increased trend in irregular northbound migration. These officials cited both U.S. and Canadian reporting on the 2016 U.S. Presidential Election, along with a welcoming statement by the government of Canada, and perceived generosity of benefits upon application for asylum in Canada as reasons that migrants seek to enter Canada between official ports of entry and claim asylum. According to Border Patrol officials, the northbound asylum flows from the United States to Canada could potentially lead to future attempts to enter the United States illegally between ports of entry from Canada by individuals whose asylum claims are rejected by the government of Canada. According to anecdotal reporting to Border Patrol officials, some of the irregular northbound migrants who entered Canada from the United States were unable to gain status in Canada or the process was not what they had anticipated. According to the officials, these individuals subsequently attempted to reenter the United States in an effort to gain legal status in the United States. For example, Swanton Border Patrol Sector reported two incidents in April 2018 in which groups of individuals who were apprehended attempting to illegally enter the United States from Canada stated that they were seeking to reenter the United States after their asylum claims were rejected by the government of Canada. In addition to the contact named above, Christopher Ferencik (Assistant Director), David Alexander, Michele Fejfar, Eric Hauswirth, Grant Holyoak, John Mingus, Sasan J. “Jon” Najmi, Claire Peachey, Carl Potenzieri, and Natalie Swabb made key contributions to this report.