; (2) the interaction of such System with the process to admit nonimmigrant workers pursuant to section 218 or 218A of the Immigration and Nationality Act ( 8 U.S.C. 1188 et seq.) and with enforcement of the immigration laws; and (3) the collaborative use of processes of other Federal and State agencies that intersect with the agriculture industry. 4. Report on impact of the system on employers Not later than 18 months after the date of the enactment of this Act, the Secretary of Homeland Security shall submit a report to Congress that assesses— (1) the implementation by employers of the Employment Verification System established under section 274A(d) of the Immigration and Nationality Act, as amended by section 2; (2) any adverse impact on the revenues, business processes, or profitability of employers required to use such System; and (3) the economic impact of such System on small businesses. 5. Government Accountability Office study of the effects of document requirements on employment authorized persons and employers (a) Study The Comptroller General of the United States shall carry out a study of— (1) the effects of the documentary requirements under section 274A of the Immigration and Nationality Act, as amended by section 2, on employers, naturalized United States citizens, nationals of the United States, and individuals with employment authorized status; and (2) the challenges such employers, citizens, nationals, or individuals may face in obtaining the documentation required under that section. (b) Report (1) In general Not later than 4 years after the date of the enactment of this Act, the Comptroller General shall submit a report to Congress containing the findings of the study carried out under subsection (a). (2) Contents The report required under paragraph (1) shall include— (A) an assessment of available information regarding the number of working age nationals of the United States and individuals who have employment authorized status who lack documents required for employment by such section 274A