Do we need copy of Naturalization certificate copy of petitioner at immigration visa IR1 interview

Hello

At the time of immigration visa IR1 interview do we need copy of Naturalization certificate copy even though we have US Passport copy of the petitioner ?

The more documents the better it is.

I am not sure if the naturalization certificate copy is mandatory or not.

But, if you can carry it with you, then you should be in a better position.