You have to prove your citizenship first.
have you already established your U.S. citizenship with us?.
I already did.
What can I do if I can't find some of the required documents?
You'll get asked for any other suitable document. Any submitted document should be current, contain all the needed information to identify you and have a recent photograph. For example, you could use your employee identification card.
What document can I use as proof of identity?
You can use your U.S. passport, state-issued non-driver ID card or your U.S. driver's license.
Would it cost anything to get the replacement card?
You can get it for free if your card is stolen or lost.
The documents must original or I can use copies?