The Attorney General shall certify to the Commissioner of Social Security such information regarding aliens who depart from the United States to any foreign country (other than a foreign country which is territorially contiguous to the continental United States) as may be necessary to enable the Commissioner of Social Security to carry out the purposes of this subsection and shall otherwise aid, assist, and cooperate with the Commissioner of Social Security in obtaining such other information as may be necessary to enable the Commissioner of Social Security to carry out the purposes of this subsection.