In January 2019, a former High Commission employee, Judith Prins, filed a sexual assault complaint with Scotland Yard alleging that Campbell groped her in 2013. A spokesperson for Campbell denied the allegation, saying the complaint was investigated and dismissed at the time. In September 2020, details emerged of a civil suit filed by Prins naming Campbell and the Government of Canada as defendants. She is seeking damages for anxiety, stress and lost income. Campbell responded to this news saying: "This has been settled once before, more than five years ago now. It was dealt with fully."