The father of a former Stanford University swimmer who received six months in jail for sexually assaulting an unconscious woman has drawn outrage by saying his son has already paid a steep price for "20 minutes of action."

Dan Turner said in a letter to the judge that the conviction has shattered 20-year-old Brock Turner, who has lost his appetite.

The letter was made public over the weekend by a Stanford law professor who wants Santa Clara Superior Court Judge Aaron Persky removed from office over the sentence.

Persky, a Stanford graduate, sentenced Brock Turner to six months in county jail and three years' probation after the victim read an emotional statement in court that got widespread attention.

Two petitions on Change.org also push for a recall of Persky, who's running unopposed for re-election Tuesday.