Right on the I-130 they tell you that if you received your residency by marriage to a USC, then you must have gotten your residency more than 5 years ago or you must meet a higher standard of proof in showing that the first marriage was not a sham. Yes, they can re-visit the validity of the first marriage.
Am a USC, not LPR. Does the 5 year bar still apply?
How long does a USC have to remain single after divorcing the person through whom they got citizenship? I need to return to UK and get married one day.