A: USCIS can interview the U.S. petitioner even when the spouse is abroad. The officer may want more information about the relationship, prior marriages, evidence, or filing history. An interview does not automatically mean denial. Review what was filed and be ready to explain the relationship accurately. Bring the notice, review the petition, and know the relationship timeline.
Sources: USCIS Family Based Petitions: https://www.uscis.gov/policy-manual/volume-6-part-b