My husband came to America on the k3 spouse visa 3 years ago from Dominican Republic. My husband received his permanent green card a month after he arrived. We plan to travel outside the country back to the DR, since he’s been here. My husband don’t have an American passport, but he has the Dominican passport he arrived to America with. I’m not sure if his Dominican passport will allow him back into America. What does my husband need to travel out the country and back into America besides his I.D. and green card.