How can I find someone's Naturalization number?

My fiance's mother is coming from out of the country for our wedding. He needs to fill out an Affadavit of Support so she can stay with us for a while, but it's asking for his naturalization number. We can't find it anywhere, who should I contact to get it?

Answer:
If he was naturalized (for example: If he is naturalized in USA as "U.S citizen" he shoud have naturalization number) If "no" then just write "non"

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