Border Tunnel Task Force Act (Sec. 2) This bill amends the Homeland Security Act of 2002 to direct the Department of Homeland Security (DHS) to establish border tunnel task forces in jurisdictions in which such task forces can contribute to border security missions after evaluating: (1) whether the areas in which they would be established are significantly impacted by cross-border threats; and (2) the availability of federal, state, local, and tribal law enforcement resources to participate in such task forces. The purpose of the task forces is to enhance and integrate border security efforts by addressing and reducing cross-border tunnel related threats and violence by facilitating collaboration among law enforcement agencies and enhancing information sharing among such agencies. DHS shall: ensure that the task forces do not unnecessarily duplicate the efforts of other existing interagency task forces or centers within such jurisdiction, establish targets and performance measures for the task forces that include consideration of whether border barriers impact cross-border tunnel threats, direct leadership of each task force to monitor progress on such targets and performance measures for each such task force, and periodically report to the congressional homeland security committees regarding progress on such targets and performance measures.