Admission into the United States by a lawful permanent resident after a temporary trip abroad merely requires that the alien present a valid unexpired immigrant visa and a valid unexpired passport or other travel document.
 Expired immigrant visas can be reissued.
mnli hypothesis:  Expired immigrant visas can be reissued. premise: Admission into the United States by a lawful permanent resident after a temporary trip abroad merely requires that the alien present a valid unexpired immigrant visa and a valid unexpired passport or other travel document.