Notwithstanding the provisions of section
1182
(a)(7)(A) of this title in such cases or in such classes of cases and under such conditions as may be by regulations prescribed, returning resident immigrants, defined in section
1101
(a)(27)(A) of this title, who are otherwise admissible may be readmitted to the United States by the Attorney General in his discretion without being required to obtain a passport, immigrant visa, reentry permit or other documentation.