TOPEKA, Kan. (AP) — Kansas' attorney general has admitted to having an extramarital affair with a former staffer, and the governor said Monday he should resign if allegations including workplace sexual harassment are proven.

The former staffer filed a civil rights claim against Attorney General Paul Morrison last month with the federal Equal Employment Opportunity Commission. According to her account, the affair began in September 2005 and lasted about two years. Linda Carter also accused him of attempting to influence a federal lawsuit involving a political opponent.

Morrison, who is married and has three children, said Sunday that many of Carter's claims are "patently false," but he confirmed they had a relationship.

Morrison, 53, was Johnson County's district attorney for 18 years before switching to the Democratic Party last year to challenge GOP conservative Phill Kline for attorney general. Republicans then picked Kline to take over Morrison's old job.