After more than 5 years as GC holder, I am now preparing to apply for US citizenship. Ever since I arrived here I never left the country even a single day. I never bother to renew my passport of my country of origin because I have no plan of leaving the country in the future. This passport expired last year. My question is should I renew my passport only for the purpose of showing it during interview or is it still OK to present the one and only expired passport? Your advice on this matter is very much appreciated. Thank you