Washington: The District Attorney in the case against US actor and comedian Bill Cosby accused him on Wednesday of "a lifetime of sexual assault" on women in a pre-trial hearing.

Kevin Steele, the District Attorney for Pennsylvania's Montgomery County, where this week another round of pre-trial hearings is underway, hopes to convince the judge that the 13 women who have accused Cosby of sexual abuse must testify at the actor's trial, which is slated to begin in June, EFE news reported.