OSAKA — The Osaka District Public Prosecutor's Office on Tuesday demanded an 18-month prison term for former Osaka Gov. "Knock" Yokoyama, who was accused of molesting a 22-year-old female campaign worker during his re-election drive in April last year.

At the trial's sixth hearing before the Osaka District Court, prosecutors said the actions of the former governor were "a disgrace and previously unheard of." They added that Yokoyama's harassment was premeditated and persistent.

According to prosecutors, Yokoyama, 68, groped the woman for about 30 minutes in the back seat of a campaign van on April 8, 1999.