; (2) examine the effectiveness and costs of alternatives to detention; and (3) submit a report containing the findings of such investigations and examinations to— (A) the Secretary; (B) the appropriate congressional committees; (C) the Committee on the Judiciary of the Senate ; and (D) the Committee on the Judiciary of the House of Representatives . (c) GAO study The Comptroller General of the United States shall conduct a study of— (1) wait times for immigration hearings for family units, including time spent in family detention, and wait times for asylum claim hearings; and (2) the root causes of family migration, including— (A) the countries of origin of families attempting to enter the United States; (B) changes in economic, political, social conditions in such countries during the 10 years immediately preceding the date of the enactment of this Act; and (C) the role of perceptions of immigration law and social media on the flow of immigration. (d) Savings provision Nothing in this section may be construed to preempt any other Federal agency, including the Office for Civil Rights and Civil Liberties, from investigating allegations of abuse of children in juvenile detention centers. 103. Reporting requirements (a) Monthly reports The Secretary, acting through the Under Secretary of Homeland Security for Management, and in coordination with the heads of other Federal Government agencies, shall submit a monthly report to the appropriate congressional committees that identifies, for the report month— (1) with respect to apprehensions by the Department of Homeland Security, the number of— (A) family units, broken down by U.S. Border Patrol sector; (B) family units originating from El Salvador, Guatemala, or Honduras, broken down by country and U.S. Border Patrol sector; (C) unaccompanied alien children, broken down by U.S. Border Patrol sector and gang affiliation