If the interviewing officer has any questions about your marital union, the best remedy would be for the spouse to be there. Why take a chance on delaying the process. It just makes sense for the US spouse to attend.
Chapter 2 - Marriage and Marital Union for Naturalization | USCIS
"In general, all naturalization applicants filing on the basis of marriage to a U.S. citizen must continue to be the spouse of a U.S. citizen from the time of filing the naturalization application until the applicant takes the Oath of Allegiance."