Re: advise needed
-
I meant mail it certified so you have proof that USCIS received the letter.
-
On the letter, mention who you are. State your case number. Write his full name, DOB, and his visa number.
-
No, it’s not really necessary for you to write a novel explaining details. All you need to say is that you suspect him of marriage fraud (ie. that he married you ONLY to obtain a greencard/US citizenship). As I wrote already, also state you’re withdrawing your sponsorship and that you have filed for divorce (or plan on doing so soon).