Can I leave the U.S. while my green card application is processing?
You should not leave the U.S. before you receive your advance parole document. If you leave the U.S. before you have an advance parole document, your green card application will be considered abandoned. In addition, even if you still have a valid nonimmigrant visa, if you try to reenter the U.S., U.S. Customs and Border Patrol will see that you previously applied for a green card and may deny your entry into the country.