Sample letter/affidavit

I believe my ex-spouse, XX XXXX, is a U.S. citizen through naturalization but I have no physical documentation of his citizenship because XXXXXX .  I request that the USCIS search its database to find proof of his citizenship.

My ex-spouse's information:

First Name:
Last Name:
Date of Birth:
Place of Birth:
Naturalized at:
Mother’s Name:
Last Known Address:

... ...