Border Security: Progress and Challenges in DHS's Efforts to Address High-Risk Travelers and Strengthen Visa Security, Statement of Rebecca Gambler, Director, Homeland Security and Justice, Testimony Before the Task Force on Denying Terrorists Entry into the United States, Committee on Homeland Security, House of Representatives [open pdf - 779KB]
From the Highlights: "DHS seeks to identify and interdict travelers who are potential security threats to the United States, such as foreign fighters and potential terrorists, human traffickers, drug smugglers and otherwise inadmissible persons, at the earliest possible point in time. DHS also adjudicates petitions for certain visa categories and has certain responsibilities for strengthening the security of the visa process, including oversight of VSP [Visa Security Program] and VWP [Visa Waiver Program]. State manages the visa adjudication process for foreign nationals seeking admission to the United States. This statement addresses (1) CBP [Customs and Border Protection] programs aimed at preventing high-risk travelers from boarding U.S.-bound flights; (2) ICE's [Immigration and Customs Enforcement] management of VSP; and (3) DHS's oversight of VWP. This statement is based on prior products GAO [Government Accountability Office] issued from March 2011 through January 2017, along with selected updates conducted in April 2017 to obtain information from DHS on actions it has taken to address prior GAO recommendations. […] GAO previously made recommendations to improve evaluation of CBP's predeparture programs' performance and strengthen DHS's oversight of VSP and VWP. DHS agreed with GAO's recommendations related to CBP's predeparture programs and VWP. DHS did not agree with some of GAO's recommendations related to VSP. GAO has ongoing work related to, among other things, DHS's management and oversight of VSP and plans to report later this year on the results of this work."
Government Accountability Office: http://www.gao.gov/